test: Parallelize testNodePort
test: Parallelize testNodePort

Regroup the test cases and run them in parallel. On my machine the
invocation of testNodePort() went from ~2:50 min to ~1:15 min.

Signed-off-by: Martynas Pumputis <6b0d31c0d563223024da45691584643ac78c96e8@lambda.lt>

michi-covalent/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,tgraf/cilium,tgraf/cilium,cilium/cilium,cilium-team/cilium,tgraf/cilium,cilium-team/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium