evolve: fixing obscache invalidation
This was missing a call to the parent's destroyed(), such that any transaction
after stripping some nodes would result in a crash (by attempting to read nodes
which were stripped).
# 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