Fix PBS relaunch issue
Fix PBS relaunch issue

When launching the TestHarness with PBS options a first time, supplying
an input file other than the default "tests", test_name no longer
matches when launching the TestHarness a second time with out suppling
the same input file argument. eg:

./run_tests --pbs -i examples
succeeded at launching all jobs and correctly concludes a status report.

./run_tests --pbs <pbs_file>
fails to find any jobs, because all the test_names are preceded by
'examples/' in their names.

Refs: #8706

milljm/moose,sapitts/moose,permcody/moose,friedmud/moose,liuwenf/moose,andrsd/moose,dschwen/moose,lindsayad/moose,harterj/moose,laagesen/moose,SudiptaBiswas/moose,bwspenc/moose,permcody/moose,milljm/moose,lindsayad/moose,liuwenf/moose,andrsd/moose,dschwen/moose,yipenggao/moose,liuwenf/moose,sapitts/moose,SudiptaBiswas/moose,nuclear-wizard/moose,sapitts/moose,bwspenc/moose,idaholab/moose,backmari/moose,jessecarterMOOSE/moose,harterj/moose,backmari/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,lindsayad/moose,nuclear-wizard/moose,lindsayad/moose,laagesen/moose,lindsayad/moose,andrsd/moose,YaqiWang/moose,dschwen/moose,dschwen/moose,bwspenc/moose,YaqiWang/moose,milljm/moose,backmari/moose,yipenggao/moose,andrsd/moose,Chuban/moose,bwspenc/moose,sapitts/moose,laagesen/moose,harterj/moose,harterj/moose,permcody/moose,milljm/moose,jessecarterMOOSE/moose,milljm/moose,jessecarterMOOSE/moose,andrsd/moose,idaholab/moose,Chuban/moose,Chuban/moose,idaholab/moose,jessecarterMOOSE/moose,nuclear-wizard/moose,liuwenf/moose,SudiptaBiswas/moose,liuwenf/moose,nuclear-wizard/moose,idaholab/moose,laagesen/moose,YaqiWang/moose,backmari/moose,bwspenc/moose,permcody/moose,liuwenf/moose,sapitts/moose,friedmud/moose,friedmud/moose,yipenggao/moose,dschwen/moose,idaholab/moose,SudiptaBiswas/moose,harterj/moose,Chuban/moose,yipenggao/moose,friedmud/moose,YaqiWang/moose,laagesen/moose