Fix port creation on shared networks

In create_port_precommit, the VM was only added to the Arista DB if
the port was associated to a network in the same tenant. But in the
case of a shared network, the port tenant and the network tenant can
be different, while the VM should still be added to the DB.

The same goes for removing resources in delete_port_postcommit.

This commit ensures the VM is added to the DB when connected to a
shared network, and that everything is cleaned-up when disconnected.

Change-Id: I295e6c87b460be4adb44e2275fa3008d3ce3eda7

networking_arista/ml2/mechanism_arista.py

@@ -211,7 +211,13 @@ class AristaDriver(driver_api.MechanismDriver):
             if not tenant_id:
                 tenant_id = context._plugin_context.tenant_id
             with self.eos_sync_lock:
-                if not db_lib.is_network_provisioned(tenant_id, network_id):
+                # If network does not exist under this tenant,
+                # it may be a shared network. Get shared network owner Id
+                net_provisioned = (
+                    db_lib.is_network_provisioned(tenant_id, network_id) or
+                    self.ndb.get_shared_network_owner_id(network_id)
+                )
+                if not net_provisioned:
                     # Ignore this request if network is not provisioned
                     return
                 db_lib.remember_tenant(tenant_id)
@@ -402,7 +408,13 @@ class AristaDriver(driver_api.MechanismDriver):
         device_owner = port['device_owner']
 
         try:
-            if not db_lib.is_network_provisioned(tenant_id, network_id):
+            # If network does not exist under this tenant,
+            # it may be a shared network. Get shared network owner Id
+            net_provisioned = (
+                db_lib.is_network_provisioned(tenant_id, network_id) or
+                self.ndb.get_shared_network_owner_id(network_id)
+            )
+            if not net_provisioned:
                 # If we do not have network associated with this, ignore it
                 return
             hostname = self._host_name(host)