Fix version for apimachinery and ugorji/go in Gopkg.toml (#1203)

This fix is an attempt to fix the issue raised #1192.
The issue that a plain `dep -ensure update` fails is because
the incompatibility of ugorji/go with the rest of packages (etcd, k8s etc)
and the incompatibility of client-go vs. apimachinery.

This fix fixed apimachinery and ugorji/go so that it is possible
to use `dep -ensure update`.

Previously updates has to be done individually, e.g.,
`dep -ensure update github.com/coreos/etcd`

This fix fixes #1192.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

vendor/google.golang.org/grpc/clientconn.go

@@ -1011,6 +1011,10 @@ func (ac *addrConn) transportMonitor() {
 		default:
 		}
 		ac.mu.Lock()
+		if ac.state == connectivity.Shutdown {
+			ac.mu.Unlock()
+			return
+		}
 		// Set connectivity state to TransientFailure before calling
 		// resetTransport. Transition READY->CONNECTING is not valid.
 		ac.state = connectivity.TransientFailure

vendor/google.golang.org/grpc/rpc_util.go

@@ -567,6 +567,6 @@ const SupportPackageIsVersion3 = true
 const SupportPackageIsVersion4 = true
 
 // Version is the current grpc version.
-const Version = "1.7.1"
+const Version = "1.7.2"
 
 const grpcUA = "grpc-go/" + Version