evolve: move logic to complete interrupted relocation to new fn
This moves logic which completed the interrupted relocation to it's own separate
function as we will need that function in continuing phase-divergence and
content-divergence too.
# utility to setup pythonpath to point into the tested repository
export SRCDIR=`dirname $TESTDIR`
if [ -n "$PYTHONPATH" ]; then
export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH
export PYTHONPATH=$SRCDIR:$PYTHONPATH
else
export PYTHONPATH=$SRCDIR
fi