Tests: Update SIPArrange tests to be more flexible
Tests: Update SIPArrange tests to be more flexible

Instead of comparing against a specific dict, check for existance of values
we care about.

artefactual/archivematica,michal-ruzicka/archivematica,sevein/archivematica,artefactual/archivematica,eckardm/archivematica,michal-ruzicka/archivematica,eckardm/archivematica,artefactual/archivematica,eckardm/archivematica,artefactual/archivematica,michal-ruzicka/archivematica,sevein/archivematica,michal-ruzicka/archivematica,sevein/archivematica,sevein/archivematica,eckardm/archivematica