Fix update_and_rebuild_libmesh.sh to exit non zero if build fails.
Fix update_and_rebuild_libmesh.sh to exit non zero if build fails.

refs #11260

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