Merged 5.2.N (5.2.1) to HEAD (5.2)

131172 cturlica: REPO-1359: Filter sites by visibility - implement the API
      - added filter sites by visibility


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@132219 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/rest/api/Sites.java

@@ -79,4 +79,5 @@ public interface Sites
 	String PARAM_SITE_DESCRIPTION = "description";
 
 	String PARAM_SITE_ROLE = "role";
+    String PARAM_VISIBILITY = "visibility";
 }