hello-openshift: Make request-port header spec compliant
hello-openshift: Make request-port header spec compliant

Change hello-openshift's `request-port` response header
to `x-request-port` to be strictly standards compliant.

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