Rabbitmq Module Updates

Use common suffix to determine what part of original term to keep and
how much of the full path to combine to get a usable filename.

Duplicate/missing import

Fixes #2026 and #2027.

Able to use "environment: " on any task to pass proxy details and other useful settings.  Can be a variable
or a dictionary.

Correct -u description in ansible man page

make things like $FILE(/etc/path/foo.conf) and $ENV(HOME) work without having to use brackets to index them

Change the 0.X part to not imply something new was added in 0.X something if a user forgets to put in a specific version in the module docs.

Had to remove the instance_tags example because our doc generator was choking on it, feel free to add it back if you can get it to be valid
YAML again :)