The idea is that some plugin would not be called in some
specific case, and the callback should decide by itself.

Having a way to globally disable it is much cleaner than
disabling every method one by one on the plugin side.

My use case is for fedora-infrastructure that cannot be run
from git checkout since it try to connect to the message bus,
but another case would be to bootstrap infrastructure, or to
run the code on a test servers without having all the callback
infrastructure setup.

use either pycurl or wget to download from launchpad, also improve error message if neither is installed

use pycurl instead of urllib2 when talking to launchpad to actually get SSL cert verification, see https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/915210 or CVE-2011-4407 for a previous similar issue in software-properties

1. Debian Squeeze is supported out of box now.
2. Repository type "deb" or "deb-src" should be explicitly specified.
3. If a source had beed added it must be possible to remove it.
4. PPA can be only used against Ubuntu hosts.

adding a little more info to the 'path' param so it's clear there are aliases (which are used in other examples) to avoid confusion

Related to PR #3823

You can write a apt action like "- apt: pkg=apt*" with this package.

Use home path expansion for virtualenv param in django_manage module

Update rax to sync with rax_clb_nodes

Add openshift inventory plugin

Conflicts:
	CHANGELOG.md

Added git disclaimer about dealing with ssh host checking

update docsite about new variable inventory_file

fix inventory.basedir is not absolute path when hostfile is startswith "./"

Fix some typos discovered during casual reading

Brings postgresql_db examples in line with documentation.

As of now, the documentation lists a parameter as "name",
whereas the examples use a parameter called "db". This brings
them in line.

forking least possible