Revert "Revert "v1alpha2 API changes (#477)" (#490)"

[ellistarn]

Issue #, if available:

Description of changes:
I believe this was previously broken due to a bad version of controller-gen. Verified working.

➜  karpenter git:(revert) ✗ stern -l karpenter=controller -n karpenter
+ karpenter-controller-7866858778-2p6v8 › manager
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:07.532Z	INFO	controller-runtime.metrics	metrics server is starting to listen	{"addr": ":8080"}
karpenter-controller-7866858778-2p6v8 manager I0630 16:51:08.542612       1 leaderelection.go:243] attempting to acquire leader lease  karpenter/karpenter-leader-election...
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:08.542Z	INFO	controller-runtime.manager	starting metrics server	{"path": "/metrics"}
karpenter-controller-7866858778-2p6v8 manager I0630 16:51:25.282568       1 leaderelection.go:253] successfully acquired lease karpenter/karpenter-leader-election
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.282Z	INFO	controller.terminator	Starting EventSource	{"reconcilerGroup": "", "reconcilerKind": "Node", "source": "kind source: /, Kind="}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.282Z	INFO	controller.provisioner/allocator	Starting EventSource	{"reconcilerGroup": "provisioning.karpenter.sh", "reconcilerKind": "Provisioner", "source": "kind source: /, Kind="}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.283Z	INFO	controller.provisioner/reallocator	Starting EventSource	{"reconcilerGroup": "provisioning.karpenter.sh", "reconcilerKind": "Provisioner", "source": "kind source: /, Kind="}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.383Z	INFO	controller.terminator	Starting Controller	{"reconcilerGroup": "", "reconcilerKind": "Node"}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.383Z	INFO	controller.provisioner/allocator	Starting Controller	{"reconcilerGroup": "provisioning.karpenter.sh", "reconcilerKind": "Provisioner"}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.383Z	INFO	controller.provisioner/allocator	Starting workers	{"reconcilerGroup": "provisioning.karpenter.sh", "reconcilerKind": "Provisioner", "worker count": 1}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.383Z	INFO	controller.terminator	Starting workers	{"reconcilerGroup": "", "reconcilerKind": "Node", "worker count": 1}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.383Z	INFO	controller.provisioner/reallocator	Starting Controller	{"reconcilerGroup": "provisioning.karpenter.sh", "reconcilerKind": "Provisioner"}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:51:25.383Z	INFO	controller.provisioner/reallocator	Starting workers	{"reconcilerGroup": "provisioning.karpenter.sh", "reconcilerKind": "Provisioner", "worker count": 1}
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:52:06.306Z	INFO	Found 5 provisionable pods
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:52:08.748Z	INFO	Binding pods [default/inflate-7ddf49bff8-bw5wj default/inflate-7ddf49bff8-2k8jv default/inflate-7ddf49bff8-n2n9l default/inflate-7ddf49bff8-dp9p6 default/inflate-7ddf49bff8-bt52t] to node ip-192-168-24-175.us-west-2.compute.internal
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:53:21.801Z	INFO	Terminated instance ip-192-168-24-175.us-west-2.compute.internal
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:53:21.981Z	INFO	Terminated instance ip-192-168-24-175.us-west-2.compute.internal
karpenter-controller-7866858778-2p6v8 manager 2021-06-30T16:53:21.989Z	ERROR	Controller failed to reconcile kind Node, terminating nodes, removing finalizer from node ip-192-168-24-175.us-west-2.compute.internal, nodes "ip-192-168-24-175.us-west-2.compute.internal" not found
git

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.