Drop prefix from package keys.
Summary: Contains Cabal submodule update, as Cabal is responsible generating package keys. We also have to update some output. Also comes with a documentation update for ghc-pkg in the user manual for --package-key. Signed-off-by: Edward Z. Yang <email@example.com> Test Plan: validate Reviewers: simonpj, austin Subscribers: thomie, bgamari Differential Revision: https://phabricator.haskell.org/D1011 GHC Trac Issues: #10550
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