[tor-bugs] #20523 [Metrics/ExoneraTor]: Use metrics-lib for parsing descriptors

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#20523: Use metrics-lib for parsing descriptors
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     Reporter:  karsten             |      Owner:
         Type:  enhancement         |     Status:  new
     Priority:  Medium              |  Milestone:
    Component:  Metrics/ExoneraTor  |    Version:
     Severity:  Normal              |   Keywords:
Actual Points:                      |  Parent ID:
       Points:                      |   Reviewer:
      Sponsor:                      |
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 We're using metrics-lib for downloading descriptors from CollecTor, but
 we're still using our own parsing code.  Let's avoid duplicating code by
 using what metrics-lib provides.

 Also update to Java 7 and metrics-lib 1.5.0.

 Branch follows in a moment.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20523>
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