tests/cluster: Check for machinesets, not platforms
tests/cluster: Check for machinesets, not platforms

We need to support running the e2e tests against AWS UPI for
example.

sallyom/origin,mfojtik/origin,mfojtik/origin,nak3/origin,spadgett/origin,jsafrane/origin,spadgett/origin,mahak/origin,csrwng/origin,bparees/origin,dinhxuanvu/origin,dinhxuanvu/origin,soltysh/origin,jeremyeder/origin,xiuwang/origin,hroyrh/origin,tnozicka/origin,mahak/origin,spadgett/origin,sallyom/origin,tnozicka/origin,tnozicka/origin,jeremyeder/origin,bparees/origin,dinhxuanvu/origin,coreydaley/origin,csrwng/origin,spadgett/origin,tnozicka/origin,gabemontero/origin,sallyom/origin,mfojtik/origin,jeremyeder/origin,jeremyeder/origin,JacobTanenbaum/origin,bparees/origin,jeremyeder/origin,dinhxuanvu/origin,tnozicka/origin,JacobTanenbaum/origin,hroyrh/origin,openshift/origin,coreydaley/origin,jsafrane/origin,hroyrh/origin,soltysh/origin,akram/origin,deads2k/origin,soltysh/origin,JacobTanenbaum/origin,nak3/origin,xiuwang/origin,deads2k/origin,csrwng/origin,nak3/origin,tnozicka/origin,gabemontero/origin,akram/origin,deads2k/origin,gabemontero/origin,openshift/origin,coreydaley/origin,xiuwang/origin,spadgett/origin,mahak/origin,jsafrane/origin,akram/origin,dinhxuanvu/origin,openshift/origin