Correct consumer_tag creation and duplicate check.
Correct consumer_tag creation and duplicate check.

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