ALF-12866: WebDAV in-memory locking: configuration

* Improved configuration: config loaded from a Hazelcast XML config file.
* Config loading similar to JGroups, e.g. "protocol" substituted into config file name.
* Hazelcast instance no longer started unless the "alfresco.cluster.name" property is set.
* Current default member discovery protocol is UDP/multicast, however this is because
  this is the default set up shipped with Hazelcast - this is likely to change to TCP.



git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@34266 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/webdav/LockStore.java

@@ -28,7 +28,7 @@ import org.alfresco.service.cmr.repository.NodeRef;
  * the actual values should be examined as necessary.
  * <p>
  * Implementations of this interface should be fast, ideally an in-memory map. Implementations should also be thread-
- * and cluster-safe.
+ * and cluster-safe (if used in a cluster).
  * 
  * @author Matt Ward
  */