Merge pull request #9944 from peterrum/compute_vertices_with_ghost_neighbors_follow_up

Create GridTools::compute_vertices_with_ghost_neighbors()

diff --cc include/deal.II/grid/grid_tools.h
Simple merge

diff --cc source/distributed/tria.cc
Simple merge

diff --cc source/dofs/dof_handler_policy.cc
Simple merge

diff --cc source/grid/grid_tools.cc
Simple merge