REGTESTS: promex: Adapt script to be less verbose

REGTESTS: promex: Adapt script to be less verbose

First, checks on the resolver scope were added. Then, because of the recent
changes, the logs emitted by vtest are now too big and this makes the script
fails. So tests on NaN values are now performed on a smaller request. This
reduces enough the logs to pass.

In fact some checks were removed