Fixes #4321

Conflicts:
	library/utilities/accelerate

This will remain in ansible.cfg only.

Conflicts:
	lib/ansible/playbook/play.py

This setting makes the timeout for each play configurable, rather than
hard-coding it at 300 seconds (now the default if left unspecified)

Fixes #4162

Conflicts:
	lib/ansible/constants.py
	lib/ansible/playbook/play.py

Commands will now be started up in a separate task from the main
handler thread, so that it can be monitored for completeness while
sending a keepalive packet back to the controller to avoid a socket
receive timeout.

Also added this feature to the CHANGELOG

Conflicts:
	CHANGELOG.md

This patch also checks specifically for a return code of 255, which
indicates an unknown SSH error of some kind. When that happens, ansible
will now recommend running with -vvvv (if not enabled) or show the
output from 'ssh -vvv' (when it is enabled)

This shouldn't generally be needed unless you're working in an environment
that uses rediculously long FQDNs; if the name is too long, you wind up
hitting unix domain socket filepath limits enforced by ssh.

The default behavior is to update_cache if changed.

If you add more then one repo, you may not want to update cache for every repo separately.
So you can now disable update_cache with this new option e.g. update_cache=no

Updating cache can also be handled using the apt module.

Fixes #4111

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