py3: almost fix test-trusted.py The test now only fails due to output format changes on the repr of mercurial.error.ParseError. I'm not really sure how to approach that for now. Differential Revision: https://phab.mercurial-scm.org/D5685

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