don't migrate if the daemonset and deployments are deleting

[paulgmiller]

Description

If calico is deployed with addonmanager there is actuall a race where addon manager will purge before operator comes up. Most of the time this seems okay. Howver if a pod is slow to terminate then the operator will migrate the deleting daemonset and nodes can get stuck pretty easily.

projectcalico/calico#4525 (comment)

Even if it's not the whole solution having operator ignore deleting daemonsets might be better than current behavior.

For PR author

• Tests for change.
• If changing pkg/apis/, run make gen-files
• If changing versions, run make gen-versions

For PR reviewers

A note for code reviewers - all pull requests must have the following:

• Milestone set according to targeted release.
• Appropriate labels:
  • kind/bug if this is a bugfix.
  • kind/enhancement if this is a a new feature.
  • enterprise if this PR applies to Calico Enterprise only.

[CLAassistant]

All committers have signed the CLA.

[caseydavenport]

This looks pretty reasonable to me - nice fix!