Assign local priority for NAA VPD descriptor

Some devices assign several NAA VPD descriptors. So implement
an internal priority to select the 'best' NAA descriptor.

References: bnc#907483

Signed-off-by: Hannes Reinecke <hare@suse.de>
libmultipath: Fall back to SG_IO if no UID could be assigned

Relying on udev attributes or sysfs vpd pages might fail,
in which case we're unable to assign an UID and multipath
will fail to start up.
Implement a fallback to read VPD page 0x83 directly in
these cases.

References: bnc#908915

Signed-off-by: Hannes Reinecke <hare@suse.de>
Add %service calls for multipathd.socket

RPMLint complained about missing %service calls in the spec file.

Signed-off-by: Hannes Reinecke <hare@suse.de>
- Update Changelog.