REST

Merge pull request #1 in HDF5VOL/rest from ~JHENDERSON/rest-vol:hdf5_1_12_update to hdf5_1_12_update

* commit 'eae4350e40072a278b3a4fabfe6f4b66b425b5a5':
  Fix issue with VOL connector initialization under certain cases
  Update more tests and examples for HDF5 1.12.0 changes
  Update user-defined link example for 1.12.0 changes
  Update a few H5VL calls from HDF5 1.12.0 changes
  Temporarily disable building of generic VOL tests
  Update for changes to H5O_info_t and H5L_info_t
  Move code for each major VOL interface into separate source files
  Update documentation
  Add VOL tests submodule
  Add HDF5 submodule to point to HDF5 1.12.0 release