[FAB-12054] Retry Operation in TestInvalidChannel

Test TestInvalidChannel fails intermittently on ppc64le,
leveraging Eventually() and thus retry.

Change-Id: I0887a15f2bcd813fe624ada1558093d945d96d40
Signed-off-by: Krishna Harsha Voora <krishvoor@in.ibm.com>

orderer/common/cluster/comm_test.go

@@ -395,6 +395,12 @@ func TestInvalidChannel(t *testing.T) {
  defer node1.stop()
 
  node1.c.Configure(testChannel, []cluster.RemoteNode{node1.nodeInfo})
+ gt := gomega.NewGomegaWithT(t)
+ gt.Eventually(func() (bool, error) {
+ _, err := node1.c.Remote(testChannel, node1.nodeInfo.ID)
+ return true, err
+ }).Should(gomega.BeTrue())
+
  stub, err := node1.c.Remote(testChannel, node1.nodeInfo.ID)
  assert.NoError(t, err)
  // An empty StepRequest has an empty channel which is invalid