Added listVMs method to the virtualizers
Make anste-clean command work with any virtualizer (WIP)
Added identifier and conf command line arguments
Do not create or download base images when using OpenStack
Move mirtualizer-dependant code to the proper virtualizer
Use identifier in the OpenStack backend
Merge branch 'rduran/virtualizer-independent-anste-clean' into rduran-aterron/multiple-anste-instances

Conflicts:
	ChangeLog
	src/ANSTE/Status.pm
	src/ANSTE/Virtualizer/OpenStack.pm
Avoid warning
Make anste-clean command work with any virtualizer
Fix some warnings
Refactor of virtualizer code
anste-clean and anste-connect should now work with multiple instances
Merge branch 'rduran/openstack-support' into rduran-aterron/multiple-anste-instances

Conflicts:
	ChangeLog
Merge pull request #38 from Zentyal/rduran-aterron/multiple-anste-instances

Rduran aterron/multiple anste instances