[tor-bugs] #6951 [Stem]: Implement a wrapper method for MAPADDRESS requests

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#6951: Implement a wrapper method for MAPADDRESS requests
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 Reporter:  neena   |          Owner:  neena
     Type:  task    |         Status:  new  
 Priority:  normal  |      Milestone:       
Component:  Stem    |        Version:       
 Keywords:          |         Parent:       
   Points:          |   Actualpoints:       
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 Implemented the map address wrapper method
 [http://repo.or.cz/w/stem/neena.git/shortlog/refs/heads/mapaddress-foo
 here].

 Things to mention:
 - Changed "SocksPort 0" to "SocksPort 29327" from the base torrc. (29327
 is random)
 - I wrote an external_ip() function in test.utils (a new file) which I'm
 not using right now. I'll be using this in a bunch of tests soon. It
 depends on http://ifconfig.me/ip being up.

 Related: [https://gitweb.torproject.org/torspec.git/blob/HEAD:/control-
 spec.txt#l384 spec].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6951>
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