d0f7c7c copr: use again a deterministic nrpe UID

Authored and Committed by praiskup 2 years ago
    copr: use again a deterministic nrpe UID
    
    It was notoriously colliding with other system users like copr-signer
    and others.
    
    Revert "copr: test without nrpe_client_uid specified"
    
    This reverts commit 435b71a695742552923c572841f8a484779a64e5.