Embed balancer.SubConn in generated MockSubConn #89
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The doc comment on balancer.SubConn mentions that users should embed the interface so that gRPC Go can add methods to it without breaking them. In #7758, grpc-go will enforce this requirement at compile time by adding an unexported method in the interface. From my reading about Gomock, it doesn't seem to support generating code with the interface already embedded. To avoid breaking the tests using this mock, this PR manually edits the mock to embed the interface.