Remove must-gather pod from lack priorityclass exception list
Remove must-gather pod from lack priorityclass exception list

must-gather pod was added exception list because `oc debug node`
does not include priorityClassName. After this PR adds
openshift/oc/pull/1263 priorityClassName statically, we can remove must-gather
pod from priorityclass exception list.

bparees/origin,akram/origin,bparees/origin,deads2k/origin,akram/origin,soltysh/origin,openshift/origin,mfojtik/origin,soltysh/origin,mahak/origin,mahak/origin,mahak/origin,deads2k/origin,bparees/origin,soltysh/origin,mfojtik/origin,openshift/origin,akram/origin,mfojtik/origin,openshift/origin,deads2k/origin