[GHC] #9606: Improve outdated ghc-pkg cache warning

[GHC]

#9606: Improve outdated ghc-pkg cache warning
-------------------------------------+-------------------------------------
        Reporter:  nh2               |                   Owner:
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  ghc-pkg           |                 Version:  7.8.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D658
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"e7fab334b31dc516d2e8f2285630cbffe9825b76/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e7fab334b31dc516d2e8f2285630cbffe9825b76"
 Improve outdated ghc-pkg cache warning (#9606)

 Summary: No more frustration.

 Test Plan: I tested it.

 Reviewers: austin

 Reviewed By: austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D658

 GHC Trac Issues: #9606
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9606#comment:4>
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