subrepo: (mostly) use relative path in "skipping missing subrepository"...
subrepo: (mostly) use relative path in "skipping missing subrepository"
This is consistent with the other messages printed by these
functions. Note that addremove is a little different and prints
absolute (aka repo-relative) paths if no argument was given.
Differential Revision:
https://phab.mercurial-scm.org/D5900