python3: enforce byte prefix for vfs.open()
Changeset ea8da5aa23c6e723d7f0006387a1a20eef58fc9a added raw prefix to open(),
but also to vfs.open(). The latter only handles bytestring arguments.
# utility to setup pythonpath to point into the tested repository
export SRCDIR="`dirname $TESTDIR`"
if [ -n "$PYTHONPATH" ]; then
export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH
if uname -o | grep -q Msys; then
export PYTHONPATH="$SRCDIR;$PYTHONPATH"
else
export PYTHONPATH=$SRCDIR:$PYTHONPATH
fi
else
export PYTHONPATH=$SRCDIR
fi