Resolve pod could be scheduled by node name.

[noahingh]

fix #72

drone-runtime use node affinity to schedule a pod on the same node, it match the name of node to kubernetes.io/hostname label. Usually it works well. But if kubernetes.io/hostname label does not use the name of node it can make a problem.

I have resolved by using the node name, it comes from the discourse. Thanks

[CLAassistant]

All committers have signed the CLA.

[MightySCollins]

@bradrydzewski This looks like this will fix an issue we are having with scheduling failing in pods. Any reason it's not yet been merged in?