evolve: use obsutil._getobsfate() directly
It's been there since 4.5 (265cd9e19d26), we can safely rely on it.
It's necessary though to use the correct spelling of superseded.
# 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