Improve logging for orphan_path()

orphan_path() is called from various sections, so add a
description to the call to aid debugging.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Set priority to '0' for PATH_BLOCKED or PATH_DOWN

When a path is down or blocked we need to initialize the priority
to '0'. Otherwise multipathd will discard the maps during reload
and fail to start if all paths are temporarily down.

References: bnc#831608

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

Some aliases for CLI command arguments were missing from the
manpage.

References: bnc#834871

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