[GHC] #11478: ghc -e shouldn't print "Loaded GHCi configuration" message

[GHC]

#11478: ghc -e shouldn't print "Loaded GHCi configuration" message
-------------------------------------+-------------------------------------
           Reporter:  rwbarton       |             Owner:  rwbarton
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  8.0.1-rc1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Phab:D1756 added a message when ghci loads a configuration file. But `ghc
 -e` is secretly ghci too, and we certainly shouldn't print the message
 then, since the output `ghc -e` is likely to be consumed by a shell script
 or the like.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11478>
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