hdf5

[svn-r28950] - remove META_FLUSH_COLLECTIVELY property for delayed sanity checks from metadata dxpls 
- remove H5AC_ind_dxpl_id and use only H5AC_dxpl_id everywhere instead.
- remove flush_me_collectively flag from cache entries
- add a collective sanity check (MPI_Barrier) for every HDF5 API routine that could possibly touch the file. This is trigerred when the environment variable H5_COLL_API_SANITY_CHECK is set to a non 0 digit.

tested on BB-8 with serial and parallel.