qa/admin/check-vm: rework dh-python check for Debian
qa/admin/check-vm: rework dh-python check for Debian

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp