test/.../disruption: set pod security level centrally
test/.../disruption: set pod security level centrally

Currently, all disruption test frameworks, most notable upgrade tests,
are being instanciated here. This sets their pod security level.

csrwng/origin,jsafrane/origin,akram/origin,csrwng/origin,gabemontero/origin,soltysh/origin,sallyom/origin,jsafrane/origin,mfojtik/origin,akram/origin,bparees/origin,gabemontero/origin,soltysh/origin,akram/origin,openshift/origin,mfojtik/origin,sallyom/origin,csrwng/origin,hroyrh/origin,mahak/origin,gabemontero/origin,deads2k/origin,hroyrh/origin,jsafrane/origin,openshift/origin,mahak/origin,soltysh/origin,openshift/origin,deads2k/origin,mfojtik/origin,hroyrh/origin,bparees/origin,mahak/origin,deads2k/origin,sallyom/origin,bparees/origin