- auth_system
- region_name

These are config settings that could be left out in many scenarios, but
the current code is requiring them. With this in place, I can get by
with this minimal .ini file:

```ini
[openstack]
version=1.1
auth_url=http://{keystone_host}:5000/v2.0
project_id=web
username={username}
api_key={password}
```

libvirt_lxc: Fix exec_command prototype for the plugin

Correct typo: 'manaul' to 'manual'

CODING_GUIDELINES: Fix typo: / => \

Fixed FreeBSD ports install issue

portage: Successful exit if sync=yes and no package provided

fixes the now-incorrect module for ApiError -- noticed since 0.3.2

apt_key clear message when downloading key returns an (http) error code

Fix missing code block in playbook variables doc

In yum module example, use present/absent instead of installed/removed

grammar fix

Fix small typographic error

A code sample was not being rendered as a code block. This adds the preceding '::' reStructuredText markup.

https://github.com/dotcloud/docker-py/blob/0.3.2/docker/errors.py
- ApiError is now(0.3.2) under the docker.errors

Fixes #7910

Allow group module to handle check_mode properly when group.state=present and group already exists

Add examples for `shell` and `command` modules.

Fix typo in playbook roles doc

Restore #6484 (YAML lists in apt) reverted by c7511688.