Correct singularName for UploadTokenRequests

[mmazur]

(At least) by convention names and singularNames are all lower case. If
they're not, it might confuse client libraries that don't lowercase
everything proactively. Example:
openshift/openshift-restclient-python#250

Release note:

Correct API discovery for UploadTokenRequests

[ovirt-infra]

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[mhenriks]

ci test please

[mhenriks]

ci test please

[mhenriks]

ci test please

[mhenriks]

ci test please

[mhenriks]

HA apparently I never officially approved this! APPROVED!!
👍