Refactor MooseMesh::ghostGhostedBoundaries() to use new build_side_list() routine.
Refactor MooseMesh::ghostGhostedBoundaries() to use new build_side_list() routine.

Refs libMesh/libmesh#1712.

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