Watcher Planner Selector

This component is responsible for selecting an appropriate Planner based
on predefined property value passed to concrete Strategy.

Change-Id: I86de95886df5d7e9558512569601e9ea3babb0e9
Implements: bp watcher-planner-selector
Co-Authored-By: Canwei Li <li.canwei2@zte.com.cn>

watcher/decision_engine/audit/continuous.py

@@ -94,7 +94,8 @@ class ContinuousAuditHandler(base.AuditHandler):
                 plan.save()
         return solution
 
-    def _next_cron_time(self, audit):
+    @staticmethod
+    def _next_cron_time(audit):
         if utils.is_cron_like(audit.interval):
             return croniter(audit.interval, datetime.datetime.utcnow()
                             ).get_next(datetime.datetime)