add check_unlock macro to dbg.h
add check_unlock macro to dbg.h

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