In some cases, where a host is mentioned in multiple groups, and those
groups are referenced in multiple ini files, a group could still contain
multiple instances of a group in its host,groups list, where only one of them
is the right group, that exists in the inventory.

Make sure all hosts and groups are unique objects
and that those are referenced uniquely everywhere.
Also fixes test_dir_inventory unit tests which were broken after previous
patches.

	modified:   lib/ansible/inventory/dir.py

The parsers check if a group already exists.

but only those with lowest depth, so we keep a proper tree structure

Fixes #6644

Fixes #6660

Fixes #6647

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.

* Added capability to support multiple keys, so clients from different
  machines can connect to a single daemon instance
* Any activity on the daemon will cause the timeout to extend, so that the
  daemon must be idle for the full number of minutes before it will auto-
  shutdown
* Various other small fixes to remove some redundancy

Fixes #5171

"print item" raises an exception when type of item is
jinja2.runtime.StrictUndefined

Signed-off-by: Max Riveiro <kavu13@gmail.com>

Clarify documentation for apt pkg, state, install_recommends