[tor-bugs] #26973 [Core Tor/Tor]: Privcount blinding and encryption: add rustfmt CI check

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#26973: Privcount blinding and encryption: add rustfmt CI check
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  privcount, 035-roadmap-master, 035   |  Actual Points:
  -triaged-in-20180711, rust                     |
Parent ID:  #25669                               |         Points:
 Reviewer:  nickm                                |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by nickm):

 * status:  needs_review => merge_ready


Comment:

 This looks okay, except for the fact that the rustfmt commit itself will
 have conflicts with my patch series currently under review.

 So my current plan here is that, once that other patch series is merged,
 we should cherry-pick everything from this branch except for the rustfmt
 commit (`bdc2db60153ef9c3044b72309cc1b35f45f85618`), and then re-run
 rustfmt separately.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26973#comment:3>
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