config options: conductor live migrate options

Moved conductor live migrate option from
"conductor/tasks/live_migrate.py"
to the new central location
"conf/conductor.py"

Change-Id: I650976969e59754235dbc7243a965b7250f945bc
Implements: blueprint centralize-config-options-newton

nova/conductor/tasks/live_migrate.py

@@ -10,13 +10,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslo_config import cfg
 from oslo_log import log as logging
 import oslo_messaging as messaging
 import six
 
 from nova.compute import power_state
 from nova.conductor.tasks import base
+import nova.conf
 from nova import exception
 from nova.i18n import _
 from nova import objects
@@ -24,15 +24,7 @@ from nova.scheduler import utils as scheduler_utils
 from nova import utils
 
 LOG = logging.getLogger(__name__)
-
-migrate_opt = cfg.IntOpt('migrate_max_retries',
-        default=-1,
-        help='Number of times to retry live-migration before failing. '
-             'If == -1, try until out of hosts. '
-             'If == 0, only try once, no retries.')
-
-CONF = cfg.CONF
-CONF.register_opt(migrate_opt)
+CONF = nova.conf.CONF
 
 
 class LiveMigrationTask(base.TaskBase):

nova/conf/conductor.py

@@ -46,6 +46,13 @@ workers = cfg.IntOpt(
     help='Number of workers for OpenStack Conductor service. '
          'The default will be the number of CPUs available.')
 
+migrate_opt = cfg.IntOpt(
+    'migrate_max_retries',
+    default=-1,
+    help='Number of times to retry live-migration before failing. '
+         'If == -1, try until out of hosts. '
+         'If == 0, only try once, no retries.')
+
 ALL_OPTS = [
     use_local,
     topic,
@@ -56,7 +63,9 @@ ALL_OPTS = [
 def register_opts(conf):
     conf.register_group(conductor_group)
     conf.register_opts(ALL_OPTS, group=conductor_group)
+    conf.register_opts([migrate_opt])
 
 
 def list_opts():
-    return {conductor_group: ALL_OPTS}
+    return {"DEFAULT": [migrate_opt],
+            conductor_group: ALL_OPTS}

nova/opts.py

@@ -17,7 +17,6 @@ import nova.cloudpipe.pipelib
 import nova.cmd.serialproxy
 import nova.cmd.spicehtml5proxy
 import nova.conductor.rpcapi
-import nova.conductor.tasks.live_migrate
 import nova.conf
 import nova.console.rpcapi
 import nova.console.serial
@@ -39,7 +38,6 @@ def list_opts():
     return [
         ('DEFAULT',
          itertools.chain(
-             [nova.conductor.tasks.live_migrate.migrate_opt],
              [nova.db.base.db_driver_opt],
              [nova.servicegroup.api.servicegroup_driver_opt],
              nova.db.api.db_opts,