Enable LBaaS v2 for Contrail

for openstack releases:

- mitaka
- newton
- ocata

Changing default driver to OpencontrailLoadbalancerDummyDriver,
the real driver is now part of svc_monitor.

Beware of auth_type=password, opencontrail looks for keystone or noauth value,
this should be fixed after MCP1.0 release.
3 files changed