[FAB-4537] Disable test causing ocassional CI failure

This changeset skips unconditionally the test that seems to be causing
the occasional panic in CI. This does not *fix* FAB-4537; a subsequent
changeset will rewrite the test so that it works w/o side-effects.

Thanks to Luis Sanchez for debugging this.

Change-Id: Ib440192b34d8a337dc4335342a4ecc6ddb0e81bb
Signed-off-by: Kostas Christidis <kostas@christidis.io>

orderer/kafka/chain_test.go

@@ -231,6 +231,8 @@ func TestChain(t *testing.T) {
 	})
 
 	t.Run("EnqueueProper", func(t *testing.T) {
+		t.Skip("Skipping test until FAB-4537 is resolved")
+
 		chain, _ := newChain(mockConsenter, mockSupport, newestOffset-1)
 
 		mockBroker.SetHandlerByMap(map[string]sarama.MockResponse{