BIND 10 #2583: save lettuce run output even if successful

[BIND 10 Development]

#2583: save lettuce run output even if successful
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            Reporter:  jreed         |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  build system  |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130402
         Sub-Project:  Core          |                   Resolution:
Estimated Difficulty:  2             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by jelte):

 * owner:  jelte => UnAssigned
 * status:  assigned => reviewing


Comment:

 ready for review

 In principle it is quite a simple change; however I could not think of any
 way to make it optional other than adding (yet another) environment
 variable, so the solution here is to specify LETTUCE_KEEP_OUTPUT=1 to let
 it not delete output files.

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Ticket URL: <http://bind10.isc.org/ticket/2583#comment:8>
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