eliminate race condition fetching certs

There's a race between the time that a CertificateConfigError is raised,
and when we check to see what caused it. Eliminating the checks and
unconditionally fetching certificates eliminates the race.

Giant thanks to Jamie Lennox for identifying the root cause described
above!

Co-Authored-By: David Stanek <dstanek@dstanek.com>
Change-Id: I19113496ceaecdc03e209d550e0db156df95f9b8
Closes-Bug: 1285833
Test commit