module_utils/atomic_move(): Restore owner/group

Manually restore owner and group if both src and dest are on a separate
file system.
module_utils/atomic_move(): Use tempfile module

Fix a potential race condition by using the tempfile module.
Add tesing deps installation into hacking/README

Signed-off-by: Max Riveiro <kavu13@gmail.com>
Fix ValueError when selection contains a colon
Remove print statements

"print item" raises an exception when type of item is
jinja2.runtime.StrictUndefined
Add missing sha1 import on known_hosts.py
Adding type int for count (in line with other cloud modules)
Merge pull request #6634 from pilou-/fix

Remove print statements
Merge pull request #6635 from pilou-/debconf

Fix ValueError when selection contains a colon
Merge pull request #6639 from fvieira/devel

Add missing sha1 import on known_hosts.py
Merge pull request #6640 from falloutdurham/ec2_count

ec2: Adding type int for count (in line with other cloud modules)
Merge pull request #6631 from kavu/add_testing_deps_to_hacking_readme

Add tesing deps installation into hacking/README
adds missing `'` to debconf examples
Update CONTRIBUTING.md

Some clarifications about workflow and the priority queue in GitHub
Merge pull request #6642 from sethwoodworth/patch-1

[docs] adds missing `'` to debconf examples
Fixes #4777 add --force-handlers option to run handlers even if tasks fail
Update changelog for force-handlers
Merge branch 'atomic_move_restore_owner_group_rebase' of https://github.com/tyll/ansible into tyll-atomic_move_restore_owner_group_rebase
Revert "add yum module downgrade support"

This reverts commit cbd1da645756e6d6fbd255bde37d9be452c547fe.