[tor-bugs] #12688 [Tor]: Make NumEntryGuards configurable by the consensus

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#12688: Make NumEntryGuards configurable by the consensus
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 Reporter:  arma         |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor          |        Version:
 Keywords:  tor-client   |  Actual Points:
Parent ID:               |         Points:
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 I plan to move clients to using 1 guard rather than 3. But I'd like to do
 that in a way that we can move them over as a group, once enough people
 have upgraded. I think that calls for a consensus param.

 I shall call it NumEntryGuards.

 And the controversial point is that I want to put it into 0.2.4.x as a
 security fix.

 The timeline will be for some folks to upgrade, then we stick it in the
 consensus as NumEntryGuards=1, then when nothing explodes, we change the
 default-if-it's-not-in-the-consensus to 1, and eventually we don't need to
 set the consensus param anymore.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12688>
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