syncbase: new naming scheme

see v.io/c/15923 for full description

MultiPart: 7/8
Change-Id: I29127d31c4e427b806d37e63850378a9a03c4cf4
diff --git a/src/vanadium-wrapper/syncbase-wrapper.js b/src/vanadium-wrapper/syncbase-wrapper.js
index 4c2565d..a56464b 100644
--- a/src/vanadium-wrapper/syncbase-wrapper.js
+++ b/src/vanadium-wrapper/syncbase-wrapper.js
@@ -276,7 +276,7 @@
     syncGroup: function(sgAdmin, name) {
       var self = this;
 
-      name = vanadium.naming.join(sgAdmin, '@@sync', name);
+      name = vanadium.naming.join(sgAdmin, '%%sync', name);
       var sg = this.db.syncGroup(name);
 
       //syncgroup-promisified