Print file name instead of processor
Print file name instead of processor

Because we are possibly returning an incomplete list,
print the filename, instead of the enumerated index
integer as the processor responsible for the file being
read.

Closes #10570

permcody/moose,milljm/moose,harterj/moose,jessecarterMOOSE/moose,jessecarterMOOSE/moose,permcody/moose,jessecarterMOOSE/moose,dschwen/moose,idaholab/moose,lindsayad/moose,laagesen/moose,idaholab/moose,YaqiWang/moose,SudiptaBiswas/moose,bwspenc/moose,bwspenc/moose,laagesen/moose,laagesen/moose,nuclear-wizard/moose,dschwen/moose,SudiptaBiswas/moose,idaholab/moose,bwspenc/moose,milljm/moose,harterj/moose,sapitts/moose,milljm/moose,bwspenc/moose,harterj/moose,nuclear-wizard/moose,lindsayad/moose,laagesen/moose,lindsayad/moose,lindsayad/moose,dschwen/moose,sapitts/moose,sapitts/moose,jessecarterMOOSE/moose,nuclear-wizard/moose,andrsd/moose,andrsd/moose,andrsd/moose,dschwen/moose,bwspenc/moose,milljm/moose,harterj/moose,SudiptaBiswas/moose,permcody/moose,YaqiWang/moose,lindsayad/moose,YaqiWang/moose,idaholab/moose,nuclear-wizard/moose,harterj/moose,sapitts/moose,dschwen/moose,idaholab/moose,milljm/moose,SudiptaBiswas/moose,YaqiWang/moose,permcody/moose,andrsd/moose,andrsd/moose,jessecarterMOOSE/moose,sapitts/moose,SudiptaBiswas/moose,laagesen/moose