tests/narrow-library.sh

dirstate: deprecated `drop` outside of `update/merge`

All core users have been migrated.

Differential Revision: https://phab.mercurial-scm.org/D11116

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