[tor-bugs] #17610 [Tor]: Merge ExitPolicyRejectPrivate changes into 0.2.6.10

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#17610: Merge ExitPolicyRejectPrivate changes into 0.2.6.10
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:
         Type:  defect   |     Status:  new
     Priority:  High     |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor      |    Version:  Tor: unspecified
     Severity:  Normal   |   Keywords:  TorCoreTeam201511, security,
Actual Points:           |  026-backport
       Points:           |  Parent ID:  #17027
                         |    Sponsor:
-------------------------+-------------------------------------------------
 ExitPolicyRejectPrivate now blocks configured outbound bind addresses and
 port addresses (such as ORPort and DirPort).

 This is the task for merging the backported change into 0.2.6.10.

 Please see my commit bug17027-reject-private-026-v4 on
 https://github.com/teor2345/tor.git

 It's a single, squashed commit based on the tor-0.2.6.10 tag. This is my
 first backport, I'm not sure if I've done it right.

 I excluded changes to the torrc files, but included unit tests (which
 pass).

 (The branch for 0.2.7.4-rc is bug17027-reject-private-027-v4 in #17027.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17610>
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