Moves Nova v3 API enable config to group

https://review.openstack.org/#/c/29487/ moves the Nova v3 API
enable flag into its own config group. And renames it to just
"enable". This changeset follows that change. As we do not yet
gate on any Nova V3 API tests we don't need to keep the old setting
around.

Change-Id: If1592cd7b9aad24b6d010870a5fb6bcc60efb8ac
Support for the ml2 quantum plugin.

Support is added for configuring devstack to use quantum's Modular L2
plugin, ml2. See https://review.openstack.org/#/c/20105/ and the
blueprint for details. Either the openvswitch or linuxbridge L2 agent
can be used with the ml2 plugin (or both in combination on different
nodes). Code configurating devstack for these L2 agents has been moved
into separate files so it can be shared between ml2 and the existing
monolithic plugins.

To use ml2 in devstack, set Q_PLUGIN=ml2 in localrc. By default it
will use the openvswitch L2 agent. To use ml2 with the linuxbridge
agent, also set Q_AGENT=linuxbridge in localrc. The local, flat, and
vlan network types are supported with either agent. Support for
openvswitch's gre network type is not yet implemented in ml2.

Note that ml2 does not yet return a useful value for binding:vif_type,
so nova's GenricVIFDriver cannot currently be used. If using the
linuxbridge agent, work around this by setting
NOVA_VIF_DRIVER=nova.virt.libvirt.vif.LinuxBridgeVIFDriver in localrc.

Implements: blueprint modular-l2
Change-Id: Ib3ed039d25295cf1ab268536cec408af8cd3795a
Merge "Moves Nova v3 API enable config to group"
Merge branch 'master' of github.com:openstack-dev/devstack