hdf5_ep

Merge pull request #845 in HDFFV/hdf5 from ~BRTNFLD/hdf5_msb:hdf5_1_10 to hdf5_1_10

* commit 'c971c366a95361cfb53e61f58f02c4caa58cd1f8': (32 commits)
  reverted changes from sync
  Snapshot version 1.11 release 1
  Fix valgrind issues
  HDFFV-9724 init var to null
  HDFFV-9724 add valgrind ENV
  Fix memory leak due to addition of FORMAT check loop
  HDFFV-9724 prefix of 0 length should be null value
  HDFFV-9724 Corrected files and verified tests
  Add library INTERFACE and MPI to tools
  Increase maximum number of retries for h5watch tests.
  Revert "Merge pull request #826 in HDFFV/hdf5 from ~BYRN/hdf5_adb:develop to develop"
  Add HD prefix
  HDFFV-9724 Remove VDS file cache functionality
  Removed incorrect MPI text
  Par example needs to link with mpi libs
  Because of MPI requirements in library ALWAYS add include path
  Cleanup comments and if() in TRY blocks
  Fix -- HDFFV-10363 Fortran compilation fails for xlf and cmake builds
  Skip test if 1.6 API
  HDFFV-9724 Add ENV VAR to vds test
  ...