Fix order for fileds in Node full_name property
Reduce connectivity node with VolumeManager.
* make sure that volume manager don't make any changes in database
* volume manager knows nothing about node, node now using only in constructor
Add assertion in disk test.
After disks update we check size of volume group.
Add more verbose logging
pep8 fix
Remove hardcoded lvm size from test
Remove paramaeter role from VolumeManager instance.
VolumeManager should know nothing about role
he just keep list of allowed volume groups.