tests/narrow-library.sh

subrepo: adjust subrepo prefix before calling subrepo.removefiles() (API)

That's what we do with the matcher so it seems more consistent.

Differential Revision: https://phab.mercurial-scm.org/D5882

cat >> $HGRCPATH <<EOF
[extensions]
narrow=
[ui]
ssh=python "$RUNTESTDIR/dummyssh"
[experimental]
changegroup3 = True
EOF