Use GMT timezone in SSL certs (#1396)

[Peter (pir)]

We've found having the GMT date confusing for people, especially with the
current redhat built version we're using where it lists a date/time with no
timezone at all. %c on more recent builds can list the wrong timezone, which
is doubly incorrect.

The only way I can think of to do what you're saying and not have it be
confusing is to force TZ to GMT before the strftime() and put it back to
whatever it was before afterwards which feels ugly at best. 

The local time representation of %c is unclear for international users, we
have people all around the world but the servers are in the US meaning we
get US format ambiguous dates that no one likes and most people can't
correctly interpret without a timezone listed. This has caused several
near-outages.

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