While we're at it, make the default match AWS's 15 minute limit (instead
of our old 5 minute limit).
UpgradeImpact
=============
This (somewhat) weakens some security protections for requests over the
S3 API; operators may want to preserve the prior behavior by setting
allowable_clock_skew = 300
in the [filter:s3api] section of their proxy-server.conf
Co-Authored-By: Alistair Coles <alistairncoles@gmail.com>
Change-Id: I0da777fcccf056e537b48af4d3277835b265d5c9
10d9a737d8