Min size of cinder volume group is 1.5GB
Increse lvm meta size to 640 and add comment
Add full_nam method for Node model, which we can use for logging
Rename parameter for create_pv
Reduce Disk and VolumeManager connectivity
Allocate boot partition (raid), lvm meta, boot records for each partition
Extract creation of PV to separate method
Use full_name method for node logging
Volumes group allocation refactoring
Remove directly used gen_default_volumes_info
Do not allocate volumes for nodes without roles i.e. nodes which not in the cluster. Also fixed size calculation of root partition for os volume group.