Fix of tmpDir util functions. Before the fix user processes didn't output anything
to the log file. static variable utilTmpDir wasn't ininialized.
Force the code to use instance-like way of managing global variables.
However this patch needs for Kapils review.



git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2798 ba6dc0ae-232f-0410-883f-9ebac64fc565