[tor-bugs] #13015 [Tor bundles/installation]: Update gitian signing+sig check+upload scripts to use tag/branch

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#13015: Update gitian signing+sig check+upload scripts to use tag/branch
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     Reporter:  mikeperry            |      Owner:  erinn
         Type:  defect               |     Status:  needs_review
     Priority:  normal               |  Milestone:
    Component:  Tor                  |    Version:
  bundles/installation               |   Keywords:  TorBrowserTeam201501R,
   Resolution:                       |  tbb-4.5-alpha-3
Actual Points:                       |  Parent ID:
       Points:                       |
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Comment (by boklm):

 I added a branch ticket_13015_v3 on my user repo with the patch rebased on
 master:
 https://gitweb.torproject.org/user/boklm/tor-browser-
 bundle.git/commit/?h=ticket_13015_v3&id=54ccb6d5636539d565a3cd0b2fbe4127e7428804

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13015#comment:10>
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