I think the probetest can be a little more pathological and I'm worried
about logging the response of each individual request at error when we
currently only log the entire failure at debug.
I have lots of async pendings sometimes.
Related-Change: Ic5d55ff368cec62ab2eb9fd883801ba4ab043dd4
Change-Id: I1c070b2b07d31552f36b647731b0b3ebed31871f