Explicitly allow node controller to access metadata server

[jerome-jutteau]

What would you like to be added:

Helm chart currently do not specify any way to access metadata server(169.254.169.254/32).
Some ccm installation (like in OpenShift), does not allow controller pod to access metadata server.

One way to do it would be to add spec.hostNetwork: True in controller's pod description as mentioned in openshift documentation.

Solution to explore would be to add n egress network policy to specifically target metadata server.

Why is this needed:

Without be able to access metadata server, some ccm setup cannot provide node details.