"removed log4js dep in persistent_search_control.js"

lib/controls/persistent_search_control.js

@@ -1,7 +1,6 @@
 var assert = require('assert');
 var asn1 = require('asn1');
 var buffer = require('buffer');
-var log4js = require('log4js');
 var Control = require('./control');
 var util = require('util');