Failure to merge Vdbs when previewing in 7.7.x

* The applicability check for the mergeVdbs method fails to find the method
  due to a lack of parameters. Adding in the parameters correctly finds
  the method and the check can be correctly tested.

plugins/teiid/org.teiid.runtime.client/src/org/teiid/runtime/client/admin/ExecutionAdmin.java

@@ -931,7 +931,7 @@ public Driver getTeiidDriver(String driverClass) throws Exception {
     @Removed(Version.TEIID_8_0)
     public void mergeVdbs( String sourceVdbName, int sourceVdbVersion, 
                                             String targetVdbName, int targetVdbVersion ) throws Exception {
-        if (!AnnotationUtils.isApplicable(getClass().getMethod("mergeVdbs"), getServer().getServerVersion()))  //$NON-NLS-1$
+        if (!AnnotationUtils.isApplicable(getClass().getMethod("mergeVdbs", String.class, int.class, String.class, int.class), getServer().getServerVersion()))  //$NON-NLS-1$
             throw new UnsupportedOperationException(Messages.getString(Messages.ExecutionAdmin.mergeVdbUnsupported));
 
         admin.mergeVDBs(sourceVdbName, sourceVdbVersion, targetVdbName, targetVdbVersion);