test: update test to check for various way to import the serveronly things
We add a "setup script" that update the PYTHONPATH to allow direct import of
the extension code. Then we tests that all way to import the extensions works.
# 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