tests/narrow-library.sh

changegroup: inline ellipsisdata()

There's only one caller of it. I don't think it needs to exist as
a standalone function.

Differential Revision: https://phab.mercurial-scm.org/D4074

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