Moved do_execute method to AuditHandler class

Both Continuous and Oneshot audits made same action in
do_execute, so it's a good idea to move it to the base
class

TrivialFix

Change-Id: Ic0353f010509ce45f94126e4db0e629417128ded

watcher/decision_engine/audit/continuous.py

@@ -71,9 +71,8 @@ class ContinuousAuditHandler(base.AuditHandler):
         return False
 
     def do_execute(self, audit, request_context):
-        # execute the strategy
-        solution = self.strategy_context.execute_strategy(
-            audit, request_context)
+        solution = super(ContinuousAuditHandler, self)\
+            .do_execute(audit, request_context)
 
         if audit.audit_type == objects.audit.AuditType.CONTINUOUS.value:
             a_plan_filters = {'audit_uuid': audit.uuid,