AdminUtils NSX|V: Fix rotuer recreate utility

The router-recreate utility failed because:
1) getting the router availability zone was done incorrectly
2) L3 code for setting the gateway needed a core-plugin

Change-Id: I03e4f782e467ce0e5d31a2b5f55d602642934c94

vmware_nsx/shell/admin/plugins/nsxv/resources/routers.py

@@ -28,6 +28,7 @@ from vmware_nsx._i18n import _LE, _LI, _LW
 from vmware_nsx.common import locking
 from vmware_nsx.db import nsxv_db
 from vmware_nsx.extensions import routersize
+from vmware_nsx.plugins.nsx_v import availability_zones as nsx_az
 from vmware_nsx.plugins.nsx_v.vshield import edge_utils
 from vmware_nsx.plugins.nsx_v.vshield import vcns_driver
 
@@ -57,6 +58,19 @@ def delete_old_edge(context, old_edge_id):
             # The edge may have been already deleted at the backend
 
 
+def _get_router_az_from_plugin_router(router):
+    # If the router edge was already deployed the availability_zones will
+    # return the az
+    az_name = router['availability_zones'][0]
+    if not az_name:
+        # If it was not deployed - it may be in the creation hints
+        az_name = router['availability_zones_hints'][0]
+    if not az_name:
+        # If not - the default az was used.
+        az_name = nsx_az.DEFAULT_NAME
+    return az_name
+
+
 @admin_utils.output_header
 def nsx_recreate_router_edge(resource, event, trigger, **kwargs):
     """Recreate a router edge with all the data on a new NSXv edge"""
@@ -110,7 +124,7 @@ def nsx_recreate_router_edge(resource, event, trigger, **kwargs):
         # Go over all the relevant routers
         for router in routers:
             router_id = router['id']
-            az_name = router['availability_zone']
+            az_name = _get_router_az_from_plugin_router(router)
             # clean up other objects related to this router
             if plugin.metadata_proxy_handler:
                 md_proxy = plugin.get_metadata_proxy_handler(az_name)

vmware_nsx/shell/admin/plugins/nsxv/resources/utils.py

@@ -19,6 +19,7 @@ from oslo_log import log as logging
 
 from neutron import context as neutron_context
 from neutron.db import common_db_mixin as common_db
+from neutron_lib.plugins import directory
 
 from vmware_nsx._i18n import _LW
 from vmware_nsx.common import config
@@ -48,6 +49,8 @@ class NsxVPluginWrapper(plugin.NsxVPlugin):
     def __init__(self):
         config.register_nsxv_azs(cfg.CONF, cfg.CONF.nsxv.availability_zones)
         super(NsxVPluginWrapper, self).__init__()
+        # Make this the core plugin
+        directory.add_plugin('CORE', self)
 
     def _start_rpc_listeners(self):
         pass