Changed call to EDITOR to allow for parameters

The EDITOR environment variable is used to create and edit files in the vault.
But if the EDITOR variable contains parameters, subprocess.call() breaks.

This fixes the EDITOR environment variable to be safely split into a list.
It adds a dependency on shlex.

Fixes #5117

Fixes #6682

Properly revert changes introduced in #6579 

Fixes #6678
Fixes #6670

Added ansible_date_time.weekday as a fact. This returns Monday,Tuesday,W...

Fixes #5114

If something is executable but doesn't look like it should be, or if
something is NOT executable and DOES looks like it should, show a
more apropos error with a hint on correcting the problem

Fixes #5113

'changed' key is not defined when task fails

Typo: assign not equal in boolean guard variable

Fix TypeError when using old simplejson lib.

On some very old simplejson does not support the 'encoding' and give
following exception:

   TypeError: __init__() got an unexpected keyword argument 'encoding'

This fix runs json.dump with no encoding key (such as before #a023cb) on
TypeError exception only.

Typo when variable controlling list of hosts left as available

Fixes #6644

Fixes #6660

Fixes #6647

fix KeyError introduced by fix of #6591.

Added ansible_date_time.weekday as a fact. This returns Monday,Tuesday,Wednesday,Thursday,Friday,Saturday, or Sunday depending on the remote servers time. Useful for backups the way I use it

This reverts commit cbd1da64.

Merge branch 'atomic_move_restore_owner_group_rebase' of https://github.com/tyll/ansible into tyll-atomic_move_restore_owner_group_rebase

[docs] adds missing `'` to debconf examples

Some clarifications about workflow and the priority queue in GitHub

Add tesing deps installation into hacking/README

ec2: Adding type int for count (in line with other cloud modules)

Add missing sha1 import on known_hosts.py

Fix ValueError when selection contains a colon

Remove print statements

This was apparently an oversite, as it has never been configurable
despite having a module parameter for the timeout.