Fix user_has_tag? issue when name and tag are the same

[shunwen]

When passing a user with name "management" and tag "management", the tag won't be created because in user_has_tag? method the tag is considered to be existed. I think it'd be easier only run rabbitmqctl -q list_user management as command, and parse the result with ruby regex function like:

cmd.run_command
user_list = cmd.stdout # => "management\t[management test]"
tags = user_list.match(/^#{name}\s+\[(.+*)\]/)[1].split # => ["management", "test"]

[tas50]

This bug is burning me right now with my monitoring user that needs the monitoring tag. It would be really great to get this merged and released.

[jjasghar]

I'm planning on releasing another version of the rabbitmq cookbook this by end of week

[tas50]

@jjasghar Any update on getting a release out with this fix?

[jjasghar]

Ideally in the next 24 hours. $DAYJOB resposibities have been taking priorities. But I blocked off my whole afternoon to get the released.