Set linux:network:bridge = openvswitch for OVS-based interfaces

Automatically set bridge type depending on interface role.

Doesn't support 'linux' bridge type at the moments, because
the salt-formula-linux don't support multiple bridge types
at the moment.

Change-Id: Icbf4a8235bb5e188831a158655f52473a440b929
diff --git "a/\173\043 interfaces \043\175/bond0_ab_nondvr_vlan_ctl_prv" "b/\173\043 interfaces \043\175/bond0_ab_nondvr_vlan_ctl_prv"
index 2287752..286b36f 100644
--- "a/\173\043 interfaces \043\175/bond0_ab_nondvr_vlan_ctl_prv"
+++ "b/\173\043 interfaces \043\175/bond0_ab_nondvr_vlan_ctl_prv"
@@ -7,6 +7,7 @@
 {#-   _param:control_network_netmask         #}
 {#-   _param:control_vlan           #}
               # {{ interfaces_role }}
+              {{- set_param('linux_network_bridge', 'openvswitch') }}
               {%- for interface_name, interface in interfaces.items() %}
               {{ interface_name }}:
                 mtu: 9000