TestVerifierSlowDownload would sometimes not have enough nodes finish in
the allotted deadline period. This increases the deadline and also does
not assert that exactly 3 have finished. Instead, in keeping with the
purpose of the test, it asserts that the slow download is never counted
as a success and is always counted as a pending audit in the final
report.
Change-Id: I180734fcc4a499420c75164bad6253ed155d87de
5a85e8d749