This adds a setup script for each tox functional target to start a
rabbitmq-server, qpidd or redis daemon dedicated for the functional
testing.
This script is responsible to spawn a preconfigured daemon needed for
the functional tests.
This also changes the gate script to just install the required packages
instead of setup a devstack.
This also fixes the zmq config options loading in tests
Closes-bug: #1442612
Change-Id: I27eb2c1d3d0ca67aa361c83e41372138e03d9bdd