Octant could restart registered plugins

That would work great. I just tried to kill the plugin process manually, and Octant falls into a bad state, w/ this in the logs over and over:

err in navigation: grpc client response: rpc error: code = Unavailable desc = all SubConns are in TransientFailure, latest connection error: connection error: desc = "transport: error while dialing: dial unix /var/folders/51/0bdn93qj1s98v438m1y357lw0000gn/T/plugin228550586: connect: connection refused"2019-11-16T23:37:51.773-0600	ERROR	api/navigation_manager.go:97	load namespaces	{"poller-name": "navigation", "err": "grpc client response: rpc error: code = Unavailable desc = all SubConns are in TransientFailure, latest connection error: connection error: desc = \"transport: error while dialing: dial unix /var/folders/51/0bdn93qj1s98v438m1y357lw0000gn/T/plugin228550586: connect: connection refused\""}
github.com/vmware-tanzu/octant/internal/api.(*NavigationManager).runUpdate.func1
	/go/src/github.com/vmware-tanzu/octant/internal/api/navigation_manager.go:97
github.com/vmware-tanzu/octant/internal/api.(*job).run.func1
	/go/src/github.com/vmware-tanzu/octant/internal/api/poller.go:111

The webapp remains available, but the lefthand menu then disappears:

Problem resolved by restarting octant

Installing a plugin requires restart of main octant process. #178

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