Move Quantum/Neutron collection into its own plugin.

Removed quantum specific collection commands from the openstack plugin
and put them into a separate module. The plugin is also neutron/quantum
agnostic and should work for basic collection in grizzly and havana
based OpenStack installs. Open vSwitch and network namespace collection
also added.

Conflicts:
	sos/plugins/openstack.py

Signed-off-by: Brent Eagles <beagles@redhat.com>
Signed-off-by: Bryn M. Reeves <bmr@redhat.com>