#28: Add grep matcher to atf-check

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#28: Add grep matcher to atf-check
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 Reporter:  jmmv         |       Owner:  jmmv
     Type:  enhancement  |      Status:  new 
 Priority:  minor        |   Milestone:  0.10
Component:  atf-check    |     Version:      
 Keywords:               |  
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 atf-check should have a "grep" or "match" checker for stdout and stderr to
 look for regular expressions.

 Once added, swipe over the test suite to remove "atf-check ... grep"
 calls, which provide useless output when they fail and slow things down.

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Ticket URL: <https://trac.julipedia.org/atf/ticket/28>
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