[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:  new
 Priority:  normal                    |      Milestone:
Component:  Tor bundles/installation  |        Version:
 Keywords:  TorBrowserTeam201409      |  Actual Points:
Parent ID:                            |         Points:
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 We should standardize the directory location of candidate builds, to make
 it clearer what a build directory corresponds to.

 basename `git describe --all` is probably what we want to use as the
 target dir for a build.

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