Feature Description

• One-line feature description (can be used as a release note):
  Add apiserver "dry-run" query-parameter so that requests can be validated and "processed" without actually being persisted.
• Primary contact (assignee): @apelisse
• Responsible SIGs: @kubernetes/sig-api-machinery-feature-requests
• Design proposal link (community repo)/KEP:
  https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/0015-dry-run.md
• Link to e2e and/or unit tests: None yet
• Reviewer(s) - (for LGTM) recommend having 2+ reviewers (at least one from code-area OWNERS file) agreed to review. Reviewers from multiple companies preferred: @deads2k @lavalamp
• Approver (likely from SIG/area to which feature belongs): @lavalamp
• Feature target (which target equals to which milestone):
  • Alpha release target (x.y): 1.12
  • Beta release target (x.y): 1.13
  • Stable release target (x.y): 1.18