Separate Cron utility logic into its own module.

coriolis/replica_cron/api.py

@@ -1,5 +1,6 @@
 # Copyright 2017 Cloudbase Solutions Srl
 # All Rights Reserved.
+
 from coriolis.conductor.rpc import client as rpc_client
 
 

coriolis/replica_cron/rpc/server.py

@@ -1,13 +1,16 @@
+# Copyright 2017 Cloudbase Solutions Srl
+# All Rights Reserved.
+
 import json
 
-from coriolis.conductor.rpc import client as rpc_client
+from oslo_log import log as logging
+from oslo_utils import timeutils
+
 from coriolis import context
 from coriolis import exception
 from coriolis import utils
-from coriolis.replica_cron import cron
-
-from oslo_log import log as logging
-from oslo_utils import timeutils
+from coriolis.conductor.rpc import client as rpc_client
+from coriolis.cron import cron
 
 LOG = logging.getLogger(__name__)