back off the timeouts for fetch_logs

We got some timeouts yesterday, and a few more today. While this doesn't
feel like a great "fix", I can't personally prioritize a proper fix like
parallelizing the download right now-- AFAIK these logs are only used
now for sporadic, infrequent, and ad hoc grepping, as well as perhaps
giving us a second source of request logs backup (and our only backup
that currently persists indefinitely).  So, for the time being I think
it's most imporant that the data gets downloaded in it's entirety.
Hopefully this increase is enough, but if not I will increase it more,
until someone identifies a more specific reason to invest time
into making the download faster.

Test Plan:
none

Auditors: chris