Currently zmq functional gate jobs run the same configuration zeromq
for all three configurations zeromq/zeromq-proxy/zeromq-pub-sub while
locally if we run
tox -e py27-func-zeromq-proxy (or pub-sub or zeromq)
the proper one will run.
Gate job has to work similarly to what we have in local testing.
Change-Id: I94342be65564665faf27d8d01ae6650183146874
Closes-Bug: #1643929