Fixed the multi-level lock test case.
Fixed the multi-level lock test case.

Clean up after the test so that it is repeatable.
zk.Create() will only create one node, so the parent must already
exist. That's why I changed path to be just one node deep.
Use a separate "/test-multi-level" parent node instead of the "/test"
node used as a lock.

helight/helight_code,wickman/go-zookeeper,go-cloud/go-zookeeper,helight/helight_code,helight/helight_code,ChannelMeter/go-zookeeper,ngaut/go-zookeeper,helight/helight_code,dallasmarlow/go-zookeeper,lightpaw/go-zookeeper,tempbottle/go-zookeeper,cch123/go-zookeeper,mikeqian/go-zookeeper,helight/helight_code,mondough/go-zookeeper,helight/helight_code,rajivreddy/go-zookeeper,cyflhn/go-zookeeper,helight/helight_code,figoxu/go-zookeeper,helight/helight_code,kmiku7/go-zookeeper-annotated,theckman/go-zookeeper,helight/helight_code,zenoss/go-zookeeper,hailocab/go-zookeeper,aybabtme/go-zookeeper