Applies packstack::neutron::bridge class to network hosts

That puppet class was just applied only on compute hosts. Now it will be
applied on network hosts too.

Fixes: rhbz#1133968
(cherry picked from commit 7ff03828e9007afacf09b4a1b1e95ec1c29657d6)
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>

Conflicts:
	packstack/plugins/neutron_350.py

Change-Id: I3953616f3fbf07de9ea4524ae376a8e952c01bc6
Merge "Applies packstack::neutron::bridge class to network hosts" into havana