Add Quantum NEC OpenFlow plugin support

NEC OpenFlow plugin supports several OpenFlow controllers. This commit
also adds a third party script to support Trema Sliceable Switch,
one of open source OpenFlow controllers.

Change-Id: I5dddf04a25bc275c3119d751ca79b482e1875902
Change default PUBLIC_NETWORK_NAME/DEFAULT_FLOATING_POOL name

This patch changes the default network name/floating pool from nova
to pubic as the name public makes more sense than nova for a public
network.

Change-Id: I4153750c08d1510dbad3051681e8c142a79fe1a1
Allow a plugin specific interface_driver config in q-lbaas

Previously interface_driver for q-lbaas is hardcoded and q-lbaas does
not work when quantum plugin requires additional configuration (like
ovs_use_veth=True). This commit set up interface_driver using
quantum_plugin_setup_interface_driver function.

This commit also moves a script related Quantum service plugin to
lib/quantum_plugins/services/

Change-Id: Iad11c1b31071dfb580843be18be78c83feb91f10
Correctly source .stackenv

Specifically to recall HOST_IP and SERVICE_HOST for the current DevStack configuration.

Bug 930274

Change-Id: I299d94101ab93faccc88917503409e0afaa0a523
Move setup_develop call

Move setup_develop() call into the install_XXX() function as the
distinction has no real purpose.  This eliminates the configure_XXXclient()
function for Nova and Swift.

Also create install_cinderclient() as we will need it to handle dependencies
in a followup patch.

Chasing down another #$^%&&^^^$%%#$ prettytable version pin

Change-Id: I61d761bc57a31caf2ed0ade326ab236eb2bb7358
Merge "Move setup_develop call"
Merge "Correctly source .stackenv"
Merge "Allow a plugin specific interface_driver config in q-lbaas"
Merge "Add Quantum NEC OpenFlow plugin support"
Merge "Change default PUBLIC_NETWORK_NAME/DEFAULT_FLOATING_POOL name"