udevd: SAS: use SAS addr + PHY id in by-path whenever possible.

This patch changes the naming scheme for sas disks. The original names used
disk's sas address and lun, the new scheme uses sas address of the
nearest expander (if available) and a phy id of the used connection.
If no expander is used, the phy id of hba phy is used.
Note that names that refer to RAID or other abstract devices are
unchanged.

Name in raid configuration:
hba_pci_address-sas-raid_sas_address-lunY-partZ

Name in expander bare disk configuration:
hba_pci_address-sas-expander_sas_address-phyX-lunY-partZ

Name format without expanders:
hba_pci_address-sas-phyX-lunY-partZ

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>