Add command to clean dead engine from service list

Add command 'service clean' to remove dead engines
from service list.

Closes-Bug: #1495374
Change-Id: I644eee717f8e76ab9d5d7d6847442740ea201e6b

doc/source/man/heat-manage.rst

@@ -44,6 +44,10 @@ Heat Db version
 
     Shows details for all currently running heat-engines.
 
+``heat-manage service clean``
+
+    Clean dead engine records.
+
 ``heat-manage --version``
 
   Shows program's version number and exit. The output could be empty if

heat/cmd/manage.py

@@ -71,6 +71,14 @@ class ServiceManageCommand(object):
                                   svc['status'],
                                   svc['updated_at']))
 
+    def service_clean(self):
+        ctxt = context.get_admin_context()
+        for service in service_objects.Service.get_all(ctxt):
+            svc = service_utils.format_service(service)
+            if svc['status'] == 'down':
+                service_objects.Service.delete(ctxt, svc['id'])
+        print(_('Dead engines are removed.'))
+
     @staticmethod
     def add_service_parsers(subparsers):
         service_parser = subparsers.add_parser('service')
@@ -78,6 +86,8 @@ class ServiceManageCommand(object):
         service_subparsers = service_parser.add_subparsers(dest='action')
         list_parser = service_subparsers.add_parser('list')
         list_parser.set_defaults(func=ServiceManageCommand().service_list)
+        remove_parser = service_subparsers.add_parser('clean')
+        remove_parser.set_defaults(func=ServiceManageCommand().service_clean)
 
 
 def purge_deleted():