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Fixes #4104

Merge branch 'fix_changed_for_yum_group' of https://github.com/hnakamur/ansible into hnakamur-fix_changed_for_yum_group

* Added in support for freebsd-style sysctl commands
* Replaced some functionality that was provided by module_common
* Simplified some logic in a couple of places (ie, not checking
  a split with len() but instead limiting the split to 1)

Fixes #3380

Fixes #3931

Fixes #3615
Fixes #3572

Also slight modification to the error message in the earlier commit that
modified the update-rc.d detection portion of the code

Fixes #3474

By default, the service module had assumed that if the system had the
update-rc.d binary, the service was either managed via upstart or standard
sysV init-style scripts. This patch adds a check for systemctl ahead
of the other methods when update-rc.d is detected, and also simplifies
the logic around the detection of systemctl-managed services

Fixes #4068

This reverts commit ecc2b6e7.

Fixes #4069

Fixes #4026
Fixes #3989

Fixes #4025

Nova_compute wait_for fixes