DMPlex: missing PetscSFSetUp()

Pierre Jolivetrequested to merge
jolivet/fix-dmgetneighbors-sfsetup into release 
[0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
[0]PETSC ERROR: Object is in wrong state
[0]PETSC ERROR: Must call PetscSFSetUp() before obtaining ranks
[0]PETSC ERROR: #1 PetscSFGetRootRanks() line 950 in /Users/jolivet/Documents/repositories/petsc/src/vec/is/sf/interface/sf.c
[0]PETSC ERROR: #2 DMGetNeighbors_Plex() line 2603 in /Users/jolivet/Documents/repositories/petsc/src/dm/impls/plex/plexcreate.c
[0]PETSC ERROR: #3 DMGetNeighbors() line 9041 in /Users/jolivet/Documents/repositories/petsc/src/dm/interface/dm.c

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