BZ #1046120 - Unused parameter bridge_keep_ip in Neutron Networker

https://bugzilla.redhat.com/show_bug.cgi?id=1046120

Removed unused parameter from the networker.pp manifest.
Merge pull request #94 from cwolferh/bz1046120

BZ #1046120 - Unused parameter bridge_keep_ip in Neutron Networker