Update cisco support for non-ML2 case

The cisco config (even in non-ML2 case) got changed to only use a single
file. See
https://github.com/openstack/neutron/commit/f164a60f15ea042b04b250ffc2001beda4f3e4bc
for the beginning of the change.

Settings like database settings got dropped; see for instance
https://github.com/openstack/neutron/commit/74419faacf93a5e22ff6bd3f033a7fbd1c99a223
Remove obsolete default attributes
Merge pull request #39 from vuntz/cisco-non-ml2

Update cisco support for non-ML2 case