This change adjusts a few of the modifications made to the
lxc-net-bridge.cfg.j2 template file in change
I3c8225124a5f18db81259e1d52d0168ef52c3c17.
The minus signs have been removed from if and endif blocks so that
whitespace is kept intact between sections. The ordering of post-up and
post-down commands has also been changed so that iptables rules are
created before the dnsmasq service is started, as they were previously.
The default value of lxc_net_gateway has also been changed to null so
that it's evaluated as expected. Its current value, none, is evaluated
as a string.
A test has been added to compare the contents of the deployed lxc bridge
interface file with its expected contents.
Change-Id: I39d7b3f40de6ac691550c11d71bb6a182b3452f4
158d035b92