host_port_endpoints is deprecated

[jdef]

Flags should be using - delimiters instead of _.

Also the controller-manager uses this flag to determine endpoint generation, but the scheduler does NOT use this flag to determine the default port mapping strategy. There's a disconnect here.

xref kubernetes/kubernetes#21276

[jdef]

also, wondering if the kubelet-executor should also have this flag, to control (at least) the func in executor/registry that preserves container ports across pod updates -- there's no need for this code to execute if we're doing doing any kind of dynamic port assignment.

[jdef]

decided against passing the flag to the kubelet; we'll stay conservative for now, blocking any changes to pod container network configuration once it's launched.

[jdef]

cherry-picked into v0.7.3, removing cherry-pick label