[Merged by Bors] - disable k8 if build image_version is supplied #1400
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This is for #1363.
Disable building image if image version is supplied. This is useful in the Mac where building image might not work. In this case, we use image supplied built using Linux.
Also, by default use proxy for accessing Minikube cluster since Docker for Mac doesn't map ports from Minikube to host automatically.