initial work on making a test vm for archipel central server
continue moving parts of test to archipel-central-server vm
ignore qcow2
move some install scripts to archipel core
this way, when you install central agent, you can directly create pubsubs
Merge branch 'move_files_around' into test_improvements
improve archipel central server automated install
fix pubsub import
pxe support
adapt python test suite to new model with qcow-based central server
move pubsub creation files from archipel-agent to archipel-core

this way, after installing central agent, you can create all pubsubs directly from the central server
central agent does not need pil. remove dependency.
create /var/lib/archipel when installing centralagent
adapt test infra to new central server model
fix regression in central agent : better way of detecting whether central agent is enabled in config, then wait for it for 60 seconds
central agent now accepts archipel-agent-xmppserver as a plugin
Merge branch 'integ' into remove_centralagent_pil_dependency

Conflicts:
	ArchipelAgent/archipel-central-agent/setup.py
remove debug msg added by mistake
Merge branch 'move_files_around' into remove_centralagent_pil_dependency
Merge pull request #824 from nicolasochem/remove_centralagent_pil_dependency

central agent fixups.

Reviewed