[virt] version number attributes for CNV 2.6

[ousleyp]

• CNV-10319
• CP to enterprise-4.7
• The KubeVirtVersion can be found in the virt-api container: http://pkgs.devel.redhat.com/cgit/containers/virt-api/tree/Dockerfile?h=cnv-2.6-rhel-8#n49

@stu-gott and @tiraboschi please confirm these version numbers - thanks!

Note: Simone, the HCOVersion attribute is used in places like the following:

• must-gather command
• example output when deleting virt
• manifest for subscribing
• manifests in the node placement assembly

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[aburdenthehand]

lgtm

[aburdenthehand]

/cherry-pick enterprise-4.7

[openshift-cherrypick-robot]

@aburdenthehand: #29635 failed to apply on top of branch "enterprise-4.7":

Applying: version number attributes for CNV 2.6
Using index info to reconstruct a base tree...
M	modules/virt-document-attributes.adoc
Falling back to patching base and 3-way merge...
Auto-merging modules/virt-document-attributes.adoc
CONFLICT (content): Merge conflict in modules/virt-document-attributes.adoc
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 version number attributes for CNV 2.6
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

Details

In response to this:

/cherry-pick enterprise-4.7

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