Add release note for OpenShift SDN upgrade block

[jab-rh]

Version(s): 4.16

Issue: https://issues.redhat.com/browse/OSDOCS-9972

Link to docs preview: https://73796--ocpdocs-pr.netlify.app/openshift-enterprise/latest/release_notes/ocp-4-16-release-notes#ocp-4-16-networking-openshift-sdn-upgrade-block

QE review:

• [ ] QE has approved this change.

Additional information:

[openshift-merge-robot]

PR needs rebase.

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[ocpdocs-previewbot]

🤖 Wed Jun 12 22:51:50 - Prow CI generated the docs preview:

https://73796--ocpdocs-pr.netlify.app/openshift-enterprise/latest/release_notes/ocp-4-16-release-notes.html

[jab-rh]

@zhaozhanqi, this PR adds a release note about blocked cluster upgrades if using OpenShift SDN. What do you think? Thanks!

[jab-rh]

@zshi-redhat, this PR adds a release note about blocked cluster upgrades if using OpenShift SDN. What do you think? Thanks!

[zshi-redhat]

cc @pperiyasamy

[zshi-redhat]

@jab-rh In 4.16, we will enable limited ovn live migration for external customers. I noticed current suggestion points to the existing offline migration doc, which is fine. we might want to add a pointer to the limited ovn live migration once it is available (the change for live migration can be a separate PR).

looks good to me.

[jab-rh]

@zshi-redhat, this is the last that I heard about live migrations: https://issues.redhat.com/browse/OSDOCS-4936

Subsequently, we're now offering this to external customers as well?

Thanks!

[zshi-redhat]

@zshi-redhat, this is the last that I heard about live migrations: https://issues.redhat.com/browse/OSDOCS-4936

Subsequently, we're now offering this to external customers as well?

Thanks!

@jab-rh Yes, we will start offering limited ovn live migration to external customers in 4.16: https://issues.redhat.com/browse/OCPSTRAT-1184

[mburke5678]

@jab-rh A couple of comments. Otherwise LGTM.

[zhaozhanqi]

/lgtm

[openshift-ci[bot]]

New changes are detected. LGTM label has been removed.

[openshift-ci[bot]]

@jab-rh: all tests passed!

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