Always drop lxc_net bridge configuration
Always drop lxc_net bridge configuration

This patch makes sure that the lxc_net play does always write the
LXC bridge-interface configuration regardless of it's admin state.
This is particular important after we deactivate the lxc-net
systemd script as part of the LXC network configuration.

Closes-Bug: #1507795
Change-Id: I9547fe02e20e8d1690340e1193b2453997ada25c
(cherry-picked from commit a0ec97553198c432db8f0d4f6b99936221ce53df)
yanyao/openstack-deployment,yanyao/openstack-deployment,VaneCloud/openstack-ansible,yanyao/openstack-deployment,VaneCloud/openstack-ansible,VaneCloud/openstack-ansible,yanyao/openstack-deployment