Deprecate nova-api-metadata nrpe check

This change adds nova-api-metadata to the list of
deprecated services for NRPE checks. That will be
happen if disable_nova_metadata() is set to True.

Added an update to NRPE checks to quantum-network
-service changed hook, since its change defines
if nova-api-metadata should be deprecated.

Change-Id: I6b1174561f3dad3ec5334f1e38e45c068a0107a8
Closes-Bug: #1812813

hooks/neutron_hooks.py

@@ -268,6 +268,8 @@ def nm_changed():
                     service_restart('nova-api-metadata')
                 db.set('restart_nonce', restart_nonce)
                 db.flush()
+    # LP: #1812813
+    update_nrpe_config()
 
 
 @hooks.hook("cluster-relation-departed")

hooks/neutron_utils.py

@@ -1124,7 +1124,10 @@ def configure_apparmor():
 def deprecated_services():
     ''' Returns a list of deprecated services with this charm '''
     cmp_release = CompareOpenStackReleases(os_release('neutron-common'))
+    services = []
+    if disable_nova_metadata():
+        services.append('nova-api-metadata')
     if cmp_release >= 'train':
-        return ['neutron-lbaasv2-agent']
+        services.append('neutron-lbaasv2-agent')
 
-    return []
+    return services

unit_tests/test_neutron_utils.py

@@ -1067,3 +1067,11 @@ class TestNeutronAgentReallocation(CharmTestCase):
         context.AppArmorContext.assert_any_call(
             neutron_utils.NEUTRON_LBAASV2_AA_PROFILE
         )
+
+    @patch.object(neutron_utils, 'disable_nova_metadata')
+    def test_deprecated_services(self, disable_nova_metadata):
+        self.os_release.return_value = 'train'
+        disable_nova_metadata.return_value = True
+        self.assertEqual(neutron_utils.deprecated_services(),
+                         ['nova-api-metadata',
+                          'neutron-lbaasv2-agent'])