Neutron NEC plugin support is configured using DevStack external
plugin mechanism. The following needs to be added in local.conf:
Q_PLUGIN=nec
enable_plugin networking-nec https://git.openstack.org/stackforge/networking-nec
Also removes lib/neutron_thirdparty/trema and files/debs/trema.
DevStack external plugin for Trema Sliceable Switch is available
and the following is needed to enable it in DevStack.
enable_plugin trema-devstack-plugin https://github.com/nec-openstack/trema-devstack-plugin
Change-Id: If983b986355fcc0118b6e0446b3b295f23b3c40e
a3c103be7d