[FAB-3110] Add dialTimeout to gossip comm in prod

The dial timeout is only set in code paths that are in tests.
In production, the gossip layers inherit dial options that are
set in gossip_service, which doesn't set a dial timeout.

Change-Id: Icf4e2f1622712e6c5fe9dda7de52a172c08a6170
Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>

gossip/comm/comm_impl.go

@@ -124,6 +124,7 @@ func NewCommInstanceWithServer(port int, idMapper identity.Mapper, peerIdentity
 
 // NewCommInstance creates a new comm instance that binds itself to the given gRPC server
 func NewCommInstance(s *grpc.Server, cert *tls.Certificate, idStore identity.Mapper, peerIdentity api.PeerIdentityType, dialOpts ...grpc.DialOption) (Comm, error) {
+	dialOpts = append(dialOpts, grpc.WithTimeout(util.GetDurationOrDefault("peer.gossip.dialTimeout", defDialTimeout)))
 	commInst, err := NewCommInstanceWithServer(-1, idStore, peerIdentity, dialOpts...)
 	if err != nil {
 		return nil, err