Under pipelining, requests were given a 5x timeout factor due to the
way that the timeout clock works in libcurl.  Under CDN load,
connections were not being torn down quickly and it was only
this timer that led to disconnect and retry.  So, we want to
break a connection that isn't making progress but that isn't
immediately possible.  We'll compromise with a 60S timeout that
(we hope) will be neither too long for stalled connections nor
too short for large asset transfer requests.