fix test failure on BSD where pid 0 has 1 thread active
fix test failure on BSD where pid 0 has 1 thread active

git-svn-id: 9f18dd852162ff6c59c5533c0914e9cf81af9e7c@786 d8a29897-7e4b-0410-a74a-8bb4c295346f

hybridlogic/psutil,hybridlogic/psutil,hybridlogic/psutil