Restore forgotten linuxbridge-agent container

There is no mechanism to check which agent would be used and build
all the possible agents, but forgot the linuxbridge one.

Change-Id: I955a2c12b5143a63422cab50c74191bc22c63932
Signed-off-by: Maksim Malchuk <maksim.malchuk@gmail.com>

ansible/group_vars/all/kolla

@@ -202,7 +202,7 @@ overcloud_container_image_regex_map:
   - regex: neutron-server
     enabled: "{{ kolla_enable_neutron | bool }}"
   # Neutron SFC agent not currently supported on CentOS binary builds.
-  - regex: "neutron-\\(dhcp\\|l3\\|metadata\\|openvswitch\\)-agent"
+  - regex: "neutron-\\(dhcp\\|l3\\|metadata\\|linuxbridge\\|openvswitch\\)-agent"
     enabled: "{{ kolla_enable_neutron | bool }}"
   - regex: neutron-mlnx-agent
     enabled: "{{ kolla_enable_neutron_mlnx | bool }}"