[CA-1.19] CAPI backports for autoscaling workload clusters

[benmoss]

Backports the recent work @detiber did to enable running the autoscaler against a different cluster than the one it is running in.

cc @elmiko

[detiber]

vendored kubernetes commit hash for main: 3eb90c1
vendored kubernetes commit hash for cluster-autoscaler-release-1.19: 23b66ea

The new additions to vendor will likely need to be modified to match the commit hash for the branch you are targeting.

In the past I've taken the following approach:

• find the temporary directory used for the branch you are backporting to in cluster-autoscaler/go.mod and create it locally
• find the correct commit hash, you can generally find this by looking at the commit history for the vendor directory, it should see commit messages similar to 'Updating vendor against [email protected]:kubernetes/kubernetes.git:master (commit hash)'
• merge/cherry-pick the changes
• checkout cluster-autoscaler/vendor from the current upstream commit
• run cluster-autoscaler/hack/udpate-vendor.sh -d -r -r [email protected]:kubernetes/kubernetes.git

[benmoss]

I think the three directory additions are correct:

$ git -C /tmp/ca-update-vendor.LoV7/kubernetes/ rev-parse HEAD
23b66eaabd3a535dbee6474638c5bf51e78fbcfa

$ diff -q vendor/k8s.io/client-go/discovery/cached/memory/ /tmp/ca-update-vendor.LoV7/kubernetes/vendor/k8s.io/client-go/discovery/cached/memory/
Only in /tmp/ca-update-vendor.LoV7/kubernetes/vendor/k8s.io/client-go/discovery/cached/memory/: memcache_test.go

$ diff -q vendor/k8s.io/client-go/restmapper /tmp/ca-update-vendor.LoV7/kubernetes/staging/src/k8s.io/client-go/restmapper
Only in /tmp/ca-update-vendor.LoV7/kubernetes/staging/src/k8s.io/client-go/restmapper: category_expansion_test.go
Only in /tmp/ca-update-vendor.LoV7/kubernetes/staging/src/k8s.io/client-go/restmapper: discovery_test.go
Only in /tmp/ca-update-vendor.LoV7/kubernetes/staging/src/k8s.io/client-go/restmapper: shortcut_test.go

$ diff -q vendor/k8s.io/client-go/scale/fake/ /tmp/ca-update-vendor.LoV7/kubernetes/staging/src/k8s.io/client-go/scale/fake/

[elmiko]

/area provider/cluster-api

[detiber]

/lgtm

Thanks for tackling this @benmoss

[mwielgus]

/lgtm
/approve

[k8s-ci-robot]

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