evolve: remove not required calls to phases.retractboundary()
To make sure phases are preserved during evolve, we started using the
phases.new-commit config option. Now we don't need to call
phases.retractboundary(). Let's remove the redundant code.
# 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