Tiny gossip comm fix

Fixed a case only relevant for gossip integration with the peer.
The RegisterGossipServer invocation on line 107 should be skipped
if an external gRPC server is provided since it's registered on line 123

Change-Id: Ie7a730a7aef1e9e00cc8db1af44713b69a37efb6
Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>

gossip/comm/comm_impl.go

@@ -101,20 +101,18 @@ func NewCommInstanceWithServer(port int, sec SecurityProvider, pkID common.PKIid
 			defer commInst.stopWG.Done()
 			s.Serve(ll)
 		}()
-	}
 
-	proto.RegisterGossipServer(s, commInst)
+		proto.RegisterGossipServer(s, commInst)
+	}
 
 	commInst.logger.SetLevel(logging.WARNING)
 
-	time.Sleep(time.Duration(200) * time.Millisecond)
-
 	return commInst, nil
 }
 
 // NewCommInstance creates a new comm instance that binds itself to the given gRPC server
 func NewCommInstance(s *grpc.Server, sec SecurityProvider, PKIID common.PKIidType, dialOpts ...grpc.DialOption) (Comm, error) {
-	commInst, err := NewCommInstanceWithServer(-1, sec, PKIID)
+	commInst, err := NewCommInstanceWithServer(-1, sec, PKIID, dialOpts ...)
 	if err != nil {
 		return nil, err
 	}