Issue Summary:

Currently the tests for BasicGoogleDeployHandler are disabled due to bad practices on the code that is deploying GCE instances in Spinnaker. It is hard to test existing and new features with the existing implementation.

Cloud Provider(s):

Google - GCE

Additional Details:

BasicGoodleDeployHandler class is responsible on create InstanceTemplates and Instance Groups for GCE but it is a single method with ~500 lines of code: https://github.com/spinnaker/clouddriver/blob/master/clouddriver-google/src/main/groovy/com/netflix/spinnaker/clouddriver/google/deploy/handlers/BasicGoogleDeployHandler.groovy#L148
it is almost imposible to mock everything to test and the existing tests are disabled: https://github.com/spinnaker/clouddriver/blob/master/clouddriver-google/src/test/groovy/com/netflix/spinnaker/clouddriver/google/deploy/handlers/BasicGoogleDeployHandlerSpec.groovy

We need to refactor the code to test GCE features properly.