OCPBUGS-7844: Fix multus to support CNI plugin which does not create interface [backport 4.12]

[dougbtv]

This change fixes multus to support CNI plugin which does not create any interface and return empty result. Some CNI plugin may do network configuration change only and does not create any interface and return empty CNI result. Current multus assumes that CNI config always creates some interfaces hence above CNI plugin is out of assumption and multus may not work with such plugins.

[openshift-ci]

@dougbtv: No Bugzilla bug is referenced in the title of this pull request.
To reference a bug, add 'Bug XXX:' to the title of this pull request and request another bug refresh with /bugzilla refresh.

In response to this:

OCPBUGS-7844: Fix multus to support CNI plugin which does not create interface [backport 4.12]

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[openshift-ci-robot]

@dougbtv: This pull request references Jira Issue OCPBUGS-7844, which is invalid:

• expected dependent Jira Issue OCPBUGS-13814 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), but it is New instead
• expected dependent Jira Issue OCPBUGS-7792 to target a version in 4.13.0, 4.13.z, but it targets "4.12.z" instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

This change fixes multus to support CNI plugin which does not create any interface and return empty result. Some CNI plugin may do network configuration change only and does not create any interface and return empty CNI result. Current multus assumes that CNI config always creates some interfaces hence above CNI plugin is out of assumption and multus may not work with such plugins.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-ci]

@dougbtv: all tests passed!

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[s1061123]

/label backport-risk-assessed
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dougbtv, s1061123

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• OWNERS [dougbtv,s1061123]

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[weliang1]

/label cherry-pick-approved

[dougbtv]

/jira refresh

[openshift-ci-robot]

@dougbtv: This pull request references Jira Issue OCPBUGS-7844, which is invalid:

• expected dependent Jira Issue OCPBUGS-7792 to target a version in 4.13.0, 4.13.z, but it targets "4.12.z" instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

In response to this:

/jira refresh

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[dougbtv]

/jira refresh

[openshift-ci-robot]

@dougbtv: This pull request references Jira Issue OCPBUGS-7844, which is valid. The bug has been moved to the POST state.

6 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.12.z) matches configured target version for branch (4.12.z)
• bug is in the state ASSIGNED, which is one of the valid states (NEW, ASSIGNED, POST)
• dependent bug Jira Issue OCPBUGS-13814 is in the state Verified, which is one of the valid states (VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE))
• dependent Jira Issue OCPBUGS-13814 targets the "4.13.z" version, which is one of the valid target versions: 4.13.0, 4.13.z
• bug has dependents

No GitHub users were found matching the public email listed for the QA contact in Jira (weliang@redhat.com), skipping review request.

In response to this:

/jira refresh

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-ci-robot]

@dougbtv: Jira Issue OCPBUGS-7844: All pull requests linked via external trackers have merged:

• openshift/multus-cni#164

Jira Issue OCPBUGS-7844 has been moved to the MODIFIED state.

In response to this:

This change fixes multus to support CNI plugin which does not create any interface and return empty result. Some CNI plugin may do network configuration change only and does not create any interface and return empty CNI result. Current multus assumes that CNI config always creates some interfaces hence above CNI plugin is out of assumption and multus may not work with such plugins.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-merge-robot]

Fix included in accepted release 4.12.0-0.nightly-2023-05-25-102928