Merging in https://github.com/crowbar/barclamp-nova/pull/166 from pebbles.

Initial quantum linuxbridge support (vlan mode)

This patch introduces support for linuxbridge plugin for Quantum with
tenant_network set to vlan.

Restart plugin agent to pick up rabbit et al config changes
Merge pull request #124 from cdearborn/pull-req-release-mesa-1.6.1-master-2e7e34caa12af20d403f9baa19e5050351e2b7d9

Merging Linux bridge support into Mesa 1.6.1 [2/3]