Extend allowed PVC DataSources

[j-griffith]

Enhancement Description

• One-line enhancement description (can be used as a release note):
  Enable specifying an existing PVC as a DataSource parameter for creating a new PVC (Cloning)

• Kubernetes Enhancement Proposal:
  https://github.com/kubernetes/enhancements/blob/master/keps/sig-storage/20181111-extend-datasource-field.md

• Primary contact (assignee):
  j-griffith

• Responsible SIGs:
  sig-storage

• Enhancement target (which target equals to which milestone):

  • Alpha: v1.15
  • Beta: v1.16
  • GA: v1.18 (target)

[msau42]

/sig-storage
/stage alpha

[msau42]

/assign @j-griffith

[craiglpeters]

/sig storage

[saad-ali]

/milestone v1.15

[craiglpeters]

@j-griffith, Kubernetes 1.15 Enhancement Freeze is 4/30/2019. To be included in the Kubernetes 1.15 milestone, KEPs are required to be in an "Implementable" state with proper test plans and graduation criteria. Please submit any PRs needed to make this KEP adhere to inclusion criteria. If this will slip from the 1.15 milestone, please let us know so we can make appropriate tracking changes.

[j-griffith]

@craiglpeters Thanks for the reminder, I've submitted a PR updating the status to implementable here:
#1019

[christianh814]

Hey @j-griffith I'm the v1.15 docs shadow.

Does this enhancement require any new docs (or modifications)?

Just a friendly reminder we're looking for a PR against k/website (branch dev-1.15) due by Friday, May 31st. It would be great if it's the start of the full documentation, but even a placeholder PR is acceptable. Let me know if you have any questions!