Don't store UUIDs or labels of multipath members.
Don't store UUIDs or labels of multipath members.

multipath itself has absolutely no identifying metadata, so whatever
metadata found on the member is related to the multipath set's
formatting -- not the the multipath set itself (as is normally the case
when metadata is associated with a member of a container/aggregate
device). The same metadata should appear in the udev entry for the
multipath, so we can (and should) ignore it in the members' entries.

Resolves: rhbz#1254232

jkonecny12/blivet,vpodzime/blivet,jkonecny12/blivet,rvykydal/blivet,vpodzime/blivet,vojtechtrefny/blivet,rhinstaller/blivet,vojtechtrefny/blivet,rhinstaller/blivet,AdamWill/blivet,rvykydal/blivet,AdamWill/blivet