allow vhost0 to pass list of members

- in case of L3MH Contrail feature for kernel mode
BIND_INT might be a list

Change-Id: I2c44d86822b7bf74a10e7e7e81abcb22b5f639ae
(cherry picked from commit 178564d)

os_net_config/impl_ifcfg.py

@@ -1048,13 +1048,11 @@ def add_contrail_vrouter(self, contrail_vrouter):
         """
         logger.info('adding contrail_vrouter interface: %s'
                     % contrail_vrouter.name)
-        # Contrail vrouter will have the only member (of type interface,
-        # vlan or linux_bond)
-        ifname = contrail_vrouter.members[0].name
+        ifnames = ",".join([m.name for m in contrail_vrouter.members])
         data = self._add_common(contrail_vrouter)
         data += "DEVICETYPE=vhost\n"
         data += "TYPE=kernel_mode\n"
-        data += "BIND_INT=%s\n" % ifname
+        data += "BIND_INT=%s\n" % ifnames
         logger.debug('contrail data: %s' % data)
         self.interface_data[contrail_vrouter.name] = data
         if contrail_vrouter.routes:

os_net_config/schema.yaml

@@ -985,7 +985,6 @@ definitions:
                       - $ref: "#/definitions/vlan"
                       - $ref: "#/definitions/linux_bond"
                 minItems: 1
-                maxItems: 1
             # common options:
             use_dhcp:
                 $ref: "#/definitions/bool_or_param"

os_net_config/tests/test_impl_ifcfg.py

@@ -524,6 +524,18 @@
 BIND_INT=em3
 """
 
+_CONTRAIL_VROUTER_IFACE_L3MH = """# This file is autogenerated by os-net-config
+DEVICE=vhost0
+ONBOOT=yes
+HOTPLUG=no
+NM_CONTROLLED=no
+PEERDNS=no
+BOOTPROTO=none
+DEVICETYPE=vhost
+TYPE=kernel_mode
+BIND_INT=em3,em4
+"""
+
 _CONTRAIL_VROUTER_VLAN_IFACE = """# This file is autogenerated by os-net-config
 DEVICE=vhost0
 ONBOOT=yes
@@ -1025,6 +1037,17 @@ def test_add_contrail_vrouter(self):
             self.provider.interface_data['vhost0'])
         self.assertEqual('', self.get_route_config('vhost0'))
 
+    def test_add_contrail_vrouter_l3mh(self):
+        interface1 = objects.Interface('em3')
+        interface2 = objects.Interface('em4')
+        cvi = objects.ContrailVrouter('vhost0',
+                                      members=[interface1, interface2],)
+        self.provider.add_contrail_vrouter(cvi)
+        self.assertEqual(
+            _CONTRAIL_VROUTER_IFACE_L3MH,
+            self.provider.interface_data['vhost0'])
+        self.assertEqual('', self.get_route_config('vhost0'))
+
     def test_add_contrail_vrouter_vlan(self):
         addresses = [objects.Address('10.0.0.30/24')]
         interface1 = objects.Interface('vlan100')