Hide zookeeper dpendent code when compiled with standalone mode
Hide zookeeper dpendent code when compiled with standalone mode

refs #616

kumagi/jubatus_core,gintenlabo/jubatus_core,elkingtonmcb/jubatus,rimms/jubatus,elkingtonmcb/jubatus,roselleebarle04/jubatus,kumagi/jubatus_core,gintenlabo/jubatus_core,kumagi/jubatus_core,rimms/jubatus_core,rimms/jubatus_core,kmaehashi/jubatus_core,gintenlabo/jubatus,mathn/jubatus,gintenlabo/jubatus_core,rimms/jubatus,jubatus/jubatus,Asuka52/jubatus,rimms/jubatus_core,rimms/jubatus_core,kmaehashi/jubatus_core,kmaehashi/jubatus,kmaehashi/jubatus_core,kmaehashi/jubatus,kumagi/jubatus_core,gintenlabo/jubatus_core,kmaehashi/jubatus_core,gintenlabo/jubatus,jubatus/jubatus,mathn/jubatus,roselleebarle04/jubatus,jubatus/jubatus,Asuka52/jubatus