service group is not supported in generic direct invocation

- [ ] I have searched the [issues](https://github.com/apache/incubator-dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.0
* Operating System version: all
* Java version: all

### Steps to reproduce this issue

1. start a dubbo provider with service group="1.0.0"
2. start a dubbo generic consumer with referenceConfig.setGroup("1.0.0")
3. call genericService.$invoke

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

success return.

### Actual Result

not found exported service,may be version or group mismatch.

If there is an exception, please attach the exception trace:

```
Exception in thread "main" org.apache.dubbo.rpc.RpcException: Failed to invoke remote method: $invoke, provider: dubbo://127.0.0.1:20890/org.apache.dubbo.samples.context.api.ContextService?application=generic-call-consumer&dubbo=2.0.2&generic=true&group=&interface=org.apache.dubbo.samples.context.api.ContextService&pid=13296&register.ip=x.x.x.x&side=consumer&timestamp=1551067201057, cause: org.apache.dubbo.remoting.RemotingException: Not found exported service: org.apache.dubbo.samples.context.api.ContextService:20890 in [1.0.0/org.apache.dubbo.samples.context.api.ContextService:20890], may be version or group mismatch , channel: consumer: /x.x.x.x:43004 --> provider: /x.x.x.x:20890, message:RpcInvocation [methodName=$invoke, parameterTypes=[class java.lang.String, class [Ljava.lang.String;, class [Ljava.lang.Object;], arguments=[sayHello, [Ljava.lang.String;@42f5a7d7, [Ljava.lang.Object;@4c3251f9], attachments={path=org.apache.dubbo.samples.context.api.ContextService, input=342, dubbo=2.0.2, interface=org.apache.dubbo.samples.context.api.ContextService, version=0.0.0, generic=true}]
org.apache.dubbo.remoting.RemotingException: Not found exported service: org.apache.dubbo.samples.context.api.ContextService:20890 in [1.0.0/org.apache.dubbo.samples.context.api.ContextService:20890], may be version or group mismatch , channel: consumer: /x.x.x.x:43004 --> provider: /x.x.x.x:20890, message:RpcInvocation [methodName=$invoke, parameterTypes=[class java.lang.String, class [Ljava.lang.String;, class [Ljava.lang.Object;], arguments=[sayHello, [Ljava.lang.String;@42f5a7d7, [Ljava.lang.Object;@4c3251f9], attachments={path=org.apache.dubbo.samples.context.api.ContextService, input=342, dubbo=2.0.2, interface=org.apache.dubbo.samples.context.api.ContextService, version=0.0.0, generic=true}]
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.getInvoker(DubboProtocol.java:223)
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:82)
	at org.apache.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:103)
	at org.apache.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:200)
	at org.apache.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:51)
	at org.apache.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

	at org.apache.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:113)
	at org.apache.dubbo.rpc.protocol.AbstractInvoker.invoke(AbstractInvoker.java:156)
	at org.apache.dubbo.rpc.filter.GenericImplFilter.invoke(GenericImplFilter.java:172)
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:73)
	at org.apache.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:88)
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:73)
	at org.apache.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:49)
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:73)
	at org.apache.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:54)
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:73)
	at org.apache.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:77)
	at org.apache.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:57)
	at org.apache.dubbo.common.bytecode.proxy0.$invoke(proxy0.java)
	at org.apache.dubbo.samples.generic.call.GenericCallConsumer.main(GenericCallConsumer.java:74)
Caused by: org.apache.dubbo.remoting.RemotingException: org.apache.dubbo.remoting.RemotingException: Not found exported service: org.apache.dubbo.samples.context.api.ContextService:20890 in [1.0.0/org.apache.dubbo.samples.context.api.ContextService:20890], may be version or group mismatch , channel: consumer: /x.x.x.x:43004 --> provider: /x.x.x.x:20890, message:RpcInvocation [methodName=$invoke, parameterTypes=[class java.lang.String, class [Ljava.lang.String;, class [Ljava.lang.Object;], arguments=[sayHello, [Ljava.lang.String;@42f5a7d7, [Ljava.lang.Object;@4c3251f9], attachments={path=org.apache.dubbo.samples.context.api.ContextService, input=342, dubbo=2.0.2, interface=org.apache.dubbo.samples.context.api.ContextService, version=0.0.0, generic=true}]
org.apache.dubbo.remoting.RemotingException: Not found exported service: org.apache.dubbo.samples.context.api.ContextService:20890 in [1.0.0/org.apache.dubbo.samples.context.api.ContextService:20890], may be version or group mismatch , channel: consumer: /x.x.x.x:43004 --> provider: /x.x.x.x:20890, message:RpcInvocation [methodName=$invoke, parameterTypes=[class java.lang.String, class [Ljava.lang.String;, class [Ljava.lang.Object;], arguments=[sayHello, [Ljava.lang.String;@42f5a7d7, [Ljava.lang.Object;@4c3251f9], attachments={path=org.apache.dubbo.samples.context.api.ContextService, input=342, dubbo=2.0.2, interface=org.apache.dubbo.samples.context.api.ContextService, version=0.0.0, generic=true}]
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.getInvoker(DubboProtocol.java:223)
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:82)
	at org.apache.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:103)
	at org.apache.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:200)
	at org.apache.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:51)
	at org.apache.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

	at org.apache.dubbo.remoting.exchange.support.DefaultFuture.returnFromResponse(DefaultFuture.java:298)
	at org.apache.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:191)
	at org.apache.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:164)
	at org.apache.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:108)
	... 13 more
```


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