Override the 'opencontrail_compute_iface' parameter

For network role bond0_ab_contrail_single, explicitelly set
the _param:opencontrail_compute_iface to bond0, because
the wrong condition in cookiecutter-templates don't allow
to specify the correct interface name

Change-Id: Ia22b2566a8cc1750868b29d7afdf0ad1d9c9242e
diff --git "a/\173\043 interfaces \043\175/bond0_ab_contrail_single" "b/\173\043 interfaces \043\175/bond0_ab_contrail_single"
index fd4dfd5..8b175d6 100644
--- "a/\173\043 interfaces \043\175/bond0_ab_contrail_single"
+++ "b/\173\043 interfaces \043\175/bond0_ab_contrail_single"
@@ -32,6 +32,7 @@
                 - {{ interface_name }}
                 {%- endfor %}
               {{- set_param('keepalived_vip_interface', 'vhost0') }}
+              {{- set_param('opencontrail_compute_iface', 'bond0') }}
               vhost0:
                 mtu: 1450
                 address: ${_param:_esc}{_param:tenant_address}