Added FQDN Network Policy feature on GKE Cluster

[luigi-bitonti]

Added the possibily to enable FQDN Network Policy feature on standard GKE Cluster

Checklist

I applicable, I acknowledge that I have:

• Read the contributing guide
• Ran terraform fmt on all modified files
• Regenerated the relevant README.md files using tools/tfdoc.py
• Made sure all relevant tests pass

[danielmarzini]

Hey @luigi-bitonti thanks for the PR, can you also add the change on the autopilot-module?

[luigi-bitonti]

Hey @luigi-bitonti thanks for the PR, can you also add the change on the autopilot-module?

Hi Daniel, I didn't do it because GCP doc (https://cloud.google.com/kubernetes-engine/docs/how-to/fqdn-network-policies#enable_fqdn_network_policy_in_a_new_cluster) said that "You can't enable this feature when you create a new Autopilot cluster", but only on an existing one.
Do you want the feature anyway?

[danielmarzini]

Hey @luigi-bitonti thanks for the PR, can you also add the change on the autopilot-module?

Hi Daniel, I didn't do it because GCP doc (https://cloud.google.com/kubernetes-engine/docs/how-to/fqdn-network-policies#enable_fqdn_network_policy_in_a_new_cluster) said that "You can't enable this feature when you create a new Autopilot cluster", but only on an existing one. Do you want the feature anyway?

It's a good catch, I didn't see that we this one. So actually, during the preview, we can use it on existing clusters only, that would drive us to this in two steps. I think, but @juliocc keep me honest, I'd go ahead with Standard only and open an issue the integrate this as soon as it reaches the GA stage. @juliocc wdyt?

[juliocc]

I'm okay not adding the flag to autopilot as long as we open an issue to keep track of it.