tests: use {rev} instead of {node|short} and (glob) in narrow tests
I think we used {node|short} because they were first written for only
flat manifests and we didn't think to change the format when we
started testing tree manifests.
Differential Revision: https://phab.mercurial-scm.org/D4421
cat >> $HGRCPATH <<EOF
[extensions]
narrow=
[ui]
ssh=python "$TESTDIR/dummyssh"
[experimental]
changegroup3 = True
EOF