heptapod-ci: run test with python3 too
Python3 is the future^W present, it is important to run tests with it too.
Differential Revision: https://phab.mercurial-scm.org/D8013
fixbundle() {
grep -v 'saving bundle' | grep -v 'saved backup' | \
grep -v added | grep -v adding | \
grep -v "unable to find 'e' for patching" | \
grep -v "e: No such file or directory" | \
cat
}