Get the host id from the port sent to update_port when a service inst…

…ance

is created. This is needed to figure out if the host has DPDK enabled or
not.

Change-Id: Ic8d49323a667d6cbfe5b2c3a43df1a275a6e9226
Closes-Bug: 1547314

neutron_plugin_contrail/plugins/opencontrail/contrail_plugin_base.py

@@ -444,6 +444,9 @@ def update_port(self, context, port_id, port):
                 original['fixed_ips'], port['port']['fixed_ips'])
             port['port']['fixed_ips'] = prev_ips + added_ips
 
+        if 'binding:host_id' in port['port']:
+            original['binding:host_id'] = port['port']['binding:host_id']
+
         if self._is_dpdk_enabled(context, original):
             port['port'][portbindings.VIF_TYPE] = \
                 portbindings.VIF_TYPE_VHOST_USER