hdf5_msb

Merge pull request #2866 in HDFFV/hdf5 from fix_nil_collective_metadata_write to develop

* commit '45021f1826f3710a3008430ddf7216bffb7068f7':
  Update buffer count
  Revert PR 405 (https://bitbucket.hdfgroup.org/projects/HDFFV/repos/hdf5/pull-requests/405/overview) and reimplement with correct and simpler code.
  Revert "    Checkin of fix for CGNS bug"
  Revert "Removed commeted out code from H5C_dump_coll_write_list()"