fix remote execution NameError in module 'user'

Fixing logical error in detecting virtual device.

So In my Centos 5.9 machine, if there is RAID mount ansible will crash, as it cannot find scheduler file. The reason being, this should be a virtual device as there is no "device" folder under e.g. /sys/block/md0/

Here is the crash:

[kk@u1 ansible]$ ansible q3 -m setup -k -u root --tree=/tmp/facts
SSH password:
q3 | FAILED => failed to parse: /sys/block/md0
Traceback (most recent call last):
  File "/root/.ansible/tmp/ansible-1360629441.14-171498703486275/setup", line 1797, in ?
    main()
  File "/root/.ansible/tmp/ansible-1360629441.14-171498703486275/setup", line 1050, in main
    data = run_setup(module)
  File "/root/.ansible/tmp/ansible-1360629441.14-171498703486275/setup", line 1000, in run_setup
    facts = ansible_facts()
  File "/root/.ansible/tmp/ansible-1360629441.14-171498703486275/setup", line 990, in ansible_facts
    facts.update(Hardware().populate())
  File "/root/.ansible/tmp/ansible-1360629441.14-171498703486275/setup", line 312, in populate
    self.get_device_facts()
  File "/root/.ansible/tmp/ansible-1360629441.14-171498703486275/setup", line 439, in get_device_facts
    m = re.match(".*?(\[(.*)\])", scheduler)
  File "/usr/lib64/python2.4/sre.py", line 129, in match
    return _compile(pattern, flags).match(string)
TypeError: expected string or buffer

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 :)