Merge pull request #19 in HDF5VOL/daos-vol from ~JHENDERSON/daos-vol:master to master
* commit '6c61b21108fdc8c6d80d163dadaad1c94e4fa2c5':
Updates to user's guide for new H5A routines
Ensure that object is a DAOS VOL object in H5Fget_obj_count/get_obj_ids
Update VOL test submodule for h5_fileaccess fix
Update HDF5 submodule for H5VL__new_vol_obj fix
Update DAOS VOL for latest HDF5 changes
Update VOL test submodule
Fix issue with H5_daos_object_open and default LAPL
Initial implementation for H5Aexists
Add support for ACPL to attribute creation/opening/closing
Add implementation for H5Fget_obj_ids
Add implementation for H5Fget_obj_count
Correctly handle the H5F_ACC_EXCL flag
