only print log file open warning on rank 0
git-svn-id: https://svn.mcs.anl.gov/repos/darshan/trunk@425 3b7491f3-a168-0410-bf4b-c445ed680a29
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git-svn-id: https://svn.mcs.anl.gov/repos/darshan/trunk@425 3b7491f3-a168-0410-bf4b-c445ed680a29