clean up more effectively after this chroot test
clean up more effectively after this chroot test

songling88/zookeeper,rickypai/zookeeper,rickypai/zookeeper,songling88/zookeeper,rickypai/zookeeper,zk-ruby/zookeeper,rickypai/zookeeper,songling88/zookeeper,songling88/zookeeper,zk-ruby/zookeeper,zk-ruby/zookeeper