Regional instance

[Edwinhr716]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Need to support Regional Instance Templates. TWithout this change, whenever FetchMIGTemplate gets called, it will fail to find the instance template that is attached to the MIG, as it will call the global GCE API instead of regional one.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Edwinhr716 / name: Edwin Hernandez (b573351, da30b66, fd8b89e, 9916027, 145d286, 771e932, 623f132, f8b4727, 5345def, cd3ab2c)
• ✅ login: BigDarkClown / name: Bartek Wróblewski (d348ae8, 52be5d2)

[k8s-ci-robot]

Welcome @Edwinhr716!

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[BigDarkClown]

Initial review done. Please rebase on master and fix the issues, then ping me to take another look.

[BigDarkClown]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BigDarkClown, Edwinhr716

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• cluster-autoscaler/cloudprovider/gce/OWNERS [BigDarkClown]

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[x13n]

/cherry-pick cluster-autoscaler-release-1.29

[k8s-infra-cherrypick-robot]

@x13n: #6570 failed to apply on top of branch "cluster-autoscaler-release-1.29":

Applying: made changes to support MIGs that use regional instance templates
Using index info to reconstruct a base tree...
M	cluster-autoscaler/cloudprovider/gce/autoscaling_gce_client.go
M	cluster-autoscaler/cloudprovider/gce/cache.go
M	cluster-autoscaler/cloudprovider/gce/mig_info_provider.go
Falling back to patching base and 3-way merge...
Auto-merging cluster-autoscaler/cloudprovider/gce/mig_info_provider.go
Auto-merging cluster-autoscaler/cloudprovider/gce/cache.go
CONFLICT (content): Merge conflict in cluster-autoscaler/cloudprovider/gce/cache.go
Auto-merging cluster-autoscaler/cloudprovider/gce/autoscaling_gce_client.go
CONFLICT (content): Merge conflict in cluster-autoscaler/cloudprovider/gce/autoscaling_gce_client.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 made changes to support MIGs that use regional instance templates
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick cluster-autoscaler-release-1.29

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