cleanup of kerberos test
cleanup of kerberos test

beni55/node-mongodb-native,mongodb/node-mongodb-native,mongodb/node-mongodb-native,agclever/node-mongodb-native,HiLittleCat/node-mongodb-native,flyingfisher/node-mongodb-native,pakokrew/node-mongodb-native,mongodb/node-mongodb-native,mongodb/node-mongodb-native