Fix formatting indices present in python 2.6.
Change the way the tests.cluster file is generated
to handle multiple runs of the same test. We
were appending more jobs to the same file, thus
causing collisions. References #4222
remove the dumb print output statement... #4223
Merge pull request #4223 from milljm/pbs_python26

Fix formatting indices present in python 2.6.
Merge commit 'd39eeacde848c9eb37b0400d8d8d3152e08af35a'