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
Ancestors of 5
4 2 0
Ancestors of 6 and 5
4 3 2 1 0
Ancestors of 5 and 4
4 2 0
Ancestors of 7, stop at 6
6
Ancestors of 7, including revs
7 6 5 4 3 2 1 0
Ancestors of 7, 5 and 3, including revs
7 6 5 4 3 2 1 0
Descendants of 5
7 8
Descendants of 5 and 3
6 7 8
Descendants of 5 and 4
5 7 8