vmi controller: Fix UID comparison

[oshoval]

What this PR does / why we need it:
In case claim already exists,
need to compare to the expected UID
which might belong either to the VM or VMI,
depending if the VMI has owner VM or standalone.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

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Release note:

None

[oshoval]

/hold

depends on #37

[oshoval]

/hold cancel

rebased

[qinqon]

/lgtm
/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qinqon

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[qinqon]

/hold

[qinqon]

/hold cancel
all good

[oshoval]

Thanks
Will create a tag bit later so it will be consumed by CNAO etc