Also consolidated duplicate groups code into one get_groups_set() method.
Removed unused call to user_group_membership.
Removed sorting operations on set functions cause sets are inherently unordered.
Minor style improvements to match the rest of the code.

The new function will make the order of group names passed to the system command less determistic.
Which was already the case for modify_user_usermod() but not for other methods.
It will also strip out duplicate group names automatically which was not always the case previously.

Remove inline comments from inventory tokenizing.

Verify /proc/modules is readable (issue #2990)

Use get_bin_path to find mkfs command (issue #2983)

No need to expanduser() command's chdir argument twice

Updated vagrant external plugin

provide link to older docs when mentioning older docs

Add some FreeBSD facts

added:
 * ansible_distribution
 * ansible_distribution_release 
 * ansible_distribution_version
 * ansible_os_family
 * ansible_pkg_mgr
 * ansible_ssh_host_key_ecdsa_public

Also adds ECDSA public key for all plaforms.

Document: OpenStack inventory script needs grizzly

Add roles support for the script module

Adding monit module to start/stop/monitor/unmonitor process via monit

Pagerduty and Pingdom modules for core

Feature/document facts

Updated loop documentation with explicit example of hash usage

fix ambiguous use of automatically automatic in Roles docs

The OpenStack Inventory script uses the OS-EXT-IPS:type parameter
to distinguish between fixed and floating IP addresses.
This was only added in the Grizzly release, see
https://bugs.launchpad.net/nova/+bug/1117784

Specify in the docs that this inventory script requires Grizzly
or greater.