[tor-bugs] #18402 [Tor]: Reduce duplicate code in parse_*_time functions

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#18402: Reduce duplicate code in parse_*_time functions
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     Reporter:  icanhasaccount  |      Owner:
         Type:  enhancement     |     Status:  new
     Priority:  Low             |  Milestone:
    Component:  Tor             |    Version:  Tor: unspecified
     Severity:  Minor           |   Keywords:
Actual Points:                  |  Parent ID:
       Points:                  |    Sponsor:
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 parse_rfc1123_time and parse_iso_time_ call tor_timegm which duplicates
 most of the range checks - attached diff attempts to correct this.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18402>
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