[GHC] #11468: testsuite should ignore config files

[GHC]

#11468: testsuite should ignore config files
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        Reporter:  gridaphobe        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Test Suite        |              Version:  8.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 In general the testsuite handles this on a test-by-test basis, specifying
 `-ignore-dot-ghci` when using `--interactive`.

 In this case, though, this happened to uncover a real bug: we certainly
 shouldn't print the "Loaded GHCi configuration" message in `ghc -e`! Will
 file a new ticket for that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11468#comment:1>
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