Allow DHCP to go through when bridging is disabled
Allow DHCP to go through when bridging is disabled

Issue:
------
For an Interface with Health Check down, agent disables
bridging for it. further pkt module looks for bridging
enabled to allow DHCP to go through, cause a dead lock
and health check will stay in failed state unless
removed and re-added

Fix:
----
Allow DHCP request to go through even if bridging is
disabled

Closes-Bug: 1551453
Change-Id: Ibf86bfb4f04389b66f9b1458c43fd79061afd3c1

eonpatapon/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,codilime/contrail-controller,nischalsheth/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,codilime/contrail-controller,eonpatapon/contrail-controller,codilime/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller