test: Add back missing "parent" import to check-packagekit
test: Add back missing "parent" import to check-packagekit

Commit c89fd22e5 dropped the "import parent" as it was causing a
"redefinition of unused parent" pyflakes error. But it is necessary to
be able to directly call test/verify/check-packagekit (otherwise it
fails with "ImportError: No module named testlib"). So put it back, and
instead rename the "parent" argument of assertHistory().

SotolitoLabs/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,stefwalter/cockpit,harishanand95/cockpit,petervo/cockpit,mareklibra/cockpit,andreasn/cockpit,mvollmer/cockpit,xhad/cockpit,larskarlitski/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,deryni/cockpit,larsu/cockpit,michalskrivanek/cockpit,cockpituous/cockpit,deryni/cockpit,andreasn/cockpit,deryni/cockpit,michalskrivanek/cockpit,xhad/cockpit,cockpit-project/cockpit,Scribery/cockpit,stefwalter/cockpit,larsu/cockpit,mareklibra/cockpit,Scribery/cockpit,xhad/cockpit,harishanand95/cockpit,cockpit-project/cockpit,garrett/cockpit,Scribery/cockpit,moraleslazaro/cockpit,harishanand95/cockpit,harishanand95/cockpit,cockpituous/cockpit,larskarlitski/cockpit,mvollmer/cockpit,Scribery/cockpit,stefwalter/cockpit,michalskrivanek/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,martinpitt/cockpit,garrett/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,Scribery/cockpit,andreasn/cockpit,mareklibra/cockpit,cockpituous/cockpit,stefwalter/cockpit,larskarlitski/cockpit,xhad/cockpit,andreasn/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit,larskarlitski/cockpit,SotolitoLabs/cockpit,Scribery/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit,garrett/cockpit,cockpit-project/cockpit,deryni/cockpit,SotolitoLabs/cockpit,larsu/cockpit,stefwalter/cockpit,Scribery/cockpit,michalskrivanek/cockpit,deryni/cockpit,SotolitoLabs/cockpit,michalskrivanek/cockpit,harishanand95/cockpit,michalskrivanek/cockpit,andreasn/cockpit,larsu/cockpit,larskarlitski/cockpit,cockpituous/cockpit,garrett/cockpit,xhad/cockpit,petervo/cockpit,petervo/cockpit,xhad/cockpit,petervo/cockpit,cockpituous/cockpit,stefwalter/cockpit,stefwalter/cockpit,cockpit-project/cockpit,martinpitt/cockpit,michalskrivanek/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,garrett/cockpit,larsu/cockpit,xhad/cockpit,harishanand95/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,harishanand95/cockpit,mareklibra/cockpit,mareklibra/cockpit,petervo/cockpit,mareklibra/cockpit,petervo/cockpit,larsu/cockpit,andreasn/cockpit,moraleslazaro/cockpit,deryni/cockpit,mareklibra/cockpit,petervo/cockpit,mvollmer/cockpit,andreasn/cockpit,martinpitt/cockpit,deryni/cockpit