libmultipath: Only count UP and GHOST paths for prio update
libmultipath: Only count UP and GHOST paths for prio update

When calculating the priority of a pathgroup we should be
counting only UP and GHOST paths; all other values might
be stale.

References: bnc#665289

Signed-off-by: Hannes Reinecke <b0d1e9e4a4e27620745ff49be9000da3174a4cc6@suse.de>

unakatsuo/multipath-tools,vijaychauhan/multipath-tools,unakatsuo/multipath-tools,vijaychauhan/multipath-tools,unakatsuo/multipath-tools