[tor-bugs] #7938 [Stem]: Add parsing support for bridge network statuses to Stem

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#7938: Add parsing support for bridge network statuses to Stem
-------------------------+--------------------------------------------------
 Reporter:  karsten      |          Owner:  atagar
     Type:  enhancement  |         Status:  new   
 Priority:  normal       |      Milestone:        
Component:  Stem         |        Version:        
 Keywords:               |         Parent:        
   Points:               |   Actualpoints:        
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 When parsing bridge descriptor tarballs, Stem doesn't like the contained
 network statuses:

 {{{
 ParsingFailure: Unrecognized metrics descriptor format. type: 'bridge-
 network-status', version: '1.0'
 }}}

 This format isn't as explicitly defined as the formats of other network
 statuses.  Bridge network statuses start with a "@type bridge-network-
 status 1.0" line, followed by a "published" line, followed by router
 status entries, not followed by any kind of footer.  This format is
 produced by metrics-db as part of the sanitizing process.  If we were to
 specify it more explicitly, we should add a new section after the
 [https://metrics.torproject.org/formats.html#bridgedesc sanitized bridge
 descriptor specification].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7938>
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