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Automatic merge from submit-queue image name must not have leading or trailing whitespace **What this PR does / why we need it**: verifies that an image name can not have leading or trailing whitespace **Which issue this PR fixes** fixes https://github.com/kubernetes/kubernetes/issues/47490 **Special notes for your reviewer**: i was surprised we had not caught this, so if there is an image spec that says leading and trailing whitespace is a good thing, i am open to correction. i was made aware of downstream users of validate pod template spec that used " " as a special token. as a result, i only do the validation of image name " " in the `Pod` only. **Release note**: ```release-note NONE ```