Fixed RuleService concurrency around enable/disable at NodeRef level

- Done while rolling in ALF-10839: Eliminate rule discovery overhead on property update when rules have been disabled
 - Some checking of rule state done BEFORE walking up the node hierarchy
 - Also fixes ALF-4216: disabledRules List is not thread safe


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@31255 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/rule/ruletrigger/SingleNodeRefPolicyRuleTrigger.java

@@ -67,6 +67,11 @@ public class SingleNodeRefPolicyRuleTrigger extends RuleTriggerAbstractBase
 
     public void policyBehaviour(NodeRef nodeRef)
     {
+        // Break out early if rules are not enabled
+        if (!areRulesEnabled())
+        {
+            return;
+        }
         if (triggerParentRules == true)
         {
             List<ChildAssociationRef> parentsAssocRefs = this.nodeService.getParentAssocs(nodeRef);