Added listVMs method to the virtualizers
Make anste-clean command work with any virtualizer (WIP)
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