Don't default to kubenet network plugin
Don't default to kubenet network plugin

Hostports seem to require extra CNI configuration and the CNI hostport
plugin installed to work properly with kubenet.

r2d4/minikube,kubernetes/minikube,kubernetes/minikube,dlorenc/minikube,dlorenc/minikube,r2d4/minikube,warmchang/minikube,dlorenc/minikube,dims/minikube,dlorenc/minikube,dalehamel/minikube,r2d4/minikube,dims/minikube,dims/minikube,aaron-prindle/minikube,kubernetes/minikube,kubernetes/minikube,cu12/minikube,warmchang/minikube,aaron-prindle/minikube,warmchang/minikube,kubernetes/minikube,warmchang/minikube,warmchang/minikube,dlorenc/minikube,cu12/minikube,dlorenc/minikube,kubernetes/minikube,warmchang/minikube,dalehamel/minikube,kubernetes/minikube,warmchang/minikube,aaron-prindle/minikube,cu12/minikube,dlorenc/minikube,dlorenc/minikube,dalehamel/minikube