IPv6 support added

[danehans]

Feature Description

• One-line feature description (can be used as a release note): Adds support for IPv6, allowing full Kubernetes capabilities using IPv6 networking instead of IPv4 networking.
• Primary contact (assignee): @danehans
• Responsible SIGs: sig-network
• Kubernetes Enhancement Proposal PR: Graduate IPv6 support to beta #1139
• Reviewer(s) - (for LGTM) recommend having 2+ reviewers (at least one from code-area OWNERS file) agreed to review. Reviewers from multiple companies preferred: @thockin @bowei @luxas
• Approver (likely from SIG/area to which feature belongs): @thockin
• Feature target (which target equals to which milestone):
  • Alpha release target 1.9

[luxas]

@danehans Thanks for filing this feature issue!
cc @idvoretskyi FYI

[danehans]

xref ipv6 issue: kubernetes/kubernetes#1443

[zacharysarah]

@danehans 👋 Please indicate in the 1.9 feature tracking board
whether this feature needs documentation. If yes, please open a PR and add a link to the tracking spreadsheet. Thanks in advance!

[danehans]

@zacharysarah I only have comment access to the 1.9 feature tracking board, so I added comments for the IPv6 docs requirement.

cc: @mmueen

[danehans]

@zacharysarah does the 1.9-release changelog need to be manually updated to reference any of the IPv6 PRs or kubernetes/kubernetes#1443?

[zacharysarah]

@danehans When you say changelog, do you mean the release notes?

/cc @Bradamant3 for release notes visibility

[danehans]

Yes, I am trying to understand if anything needs to be added to the 1.9 release notes, and if so, what process to follow. Thank you.

[luxas]

This should have a release note