* fix bug: redis command encoding bug
* optimization: sync change on acquring lock from redis-py
* fix bug: decrement connection count on connection disconnected
* fix bug: optimize code proceed single node slots
* fix bug: initiation error of aws cluster client caused by not appropiate function list used
* fix bug: use `ssl_context` instead of ssl_keyfile,ssl_certfile,ssl_cert_reqs,ssl_ca_certs in intialization of connection_pool
<a name="1.1.1"></a>