DistributedVector GHOSTED in serial can be SERIAL
DistributedVector GHOSTED in serial can be SERIAL

We don't support ghosting in DistributedVector, but if we know every DoF
is local, we can certainly pretend.

This fixes a ton of assertion failures for me in unit tests where we
have no other linear algebra packages configured.

dschwen/libmesh,libMesh/libmesh,dschwen/libmesh,BalticPinguin/libmesh,libMesh/libmesh,dschwen/libmesh,dschwen/libmesh,libMesh/libmesh,jwpeterson/libmesh,roystgnr/libmesh,roystgnr/libmesh,libMesh/libmesh,dschwen/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,libMesh/libmesh,roystgnr/libmesh,dschwen/libmesh,libMesh/libmesh,libMesh/libmesh,dschwen/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,jwpeterson/libmesh,dschwen/libmesh,jwpeterson/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,roystgnr/libmesh,libMesh/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,jwpeterson/libmesh