Merge branch 'ps_remove_wchan_strip' into 'master'

ps: removed stripping of prefixes off wchan data

Implementation of what was settled on ML discussion: http://www.freelists.org/post/procps/ps-wchanf-option  
'ps' does not remove "do_" and "sys_" prefixes from wchan data.  
  
Resolves Red Hat Bugzilla #1322111

See merge request !33
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  Test
passed #6567682
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