Fixed warning message while closing connection. Warning message was: pika/callback.py:69: UserWarning: CallbackManager.add: Duplicate callback found for "0:Connection.CloseOk"
Fixed warning message while closing connection.
Warning message was: pika/callback.py:69: UserWarning: CallbackManager.add: Duplicate callback found for "0:Connection.CloseOk"

vitaly-krugl/pika,jstnlef/pika,zixiliuyue/pika,hugoxia/pika,reddec/pika,skftn/pika,Tarsbot/pika,renshawbay/pika-python3,shinji-s/pika,Zephor5/pika,vrtsystems/pika,benjamin9999/pika,pika/pika,knowsis/pika,fkarb/pika-python3