Use plain routes list for server-security-groups instead of stevedore

This patch adds server-security-groups related routes by a plain list,
instead of using stevedore.

After all the Nova API endpoints moves to the plain routes list,
the usage of stevedore for API loading will be removed from Nova.

Partial-implement-blueprint api-no-more-extensions-pike

Change-Id: I8bd7676ccb37a041548ef2df729130b8bdf7a28c

nova/api/openstack/compute/routes.py

@@ -327,6 +327,10 @@ server_remote_consoles_controller = functools.partial(_create_controller,
     remote_consoles.RemoteConsolesController, [], [])
 
 
+server_security_groups_controller = functools.partial(_create_controller,
+    security_groups.ServerSecurityGroupController, [], [])
+
+
 server_tags_controller = functools.partial(_create_controller,
     server_tags.ServerTagsController, [], [])
 
@@ -744,6 +748,9 @@ ROUTE_LIST = (
     ('/servers/{server_id}/remote-consoles', {
         'POST': [server_remote_consoles_controller, 'create']
     }),
+    ('/servers/{server_id}/os-security-groups', {
+        'GET': [server_security_groups_controller, 'index']
+    }),
     ('/servers/{server_id}/tags', {
         'GET': [server_tags_controller, 'index'],
         'PUT': [server_tags_controller, 'update_all'],

nova/api/openstack/compute/security_groups.py

@@ -507,14 +507,10 @@ class SecurityGroups(extensions.V21APIExtensionBase):
         return []
 
     def get_resources(self):
-        server_secgrp_ext = extensions.ResourceExtension(
-            ALIAS,
-            controller=ServerSecurityGroupController(),
-            parent=dict(member_name='server', collection_name='servers'))
         secgrp_rules_ext = extensions.ResourceExtension(
             'os-security-group-rules',
             controller=SecurityGroupRulesController())
-        return [server_secgrp_ext, secgrp_rules_ext]
+        return [secgrp_rules_ext]
 
 
 # NOTE(gmann): This function is not supposed to use 'body_deprecated_param'