Skip the test case causes zmq binding error
Skip the test case causes zmq binding error

This test case directly calls nb_api which relies on
a publisher running on local process. In ZMQ driver,
a socket needs to be binded which causes conflicts with
other df-services. But in Redis driver, the publisher
is virtual and does not actually run which makes this
test case work.

I suggest not to make direct call to nb_api in fullstack
in the future, using neutron api instead.

This bug is the last pubsub fullstack bug for zmq. When
it is merged, the pubsub fullstack will work for both zmq
and redis. At that time, I suggest to add another fullstack
gate for etcd+zmq combination.

Change-Id: If16a04f92e82c5d6851e45eb23661d9a96e37a48
Closes-Bug: #1680303

openstack/dragonflow,openstack/dragonflow,openstack/dragonflow