hdf5_msb

Merge pull request #1144 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:develop to develop

* commit '77fa93e07b2b860ca314b2c332ebd440544e3326':
  Add cmakehdf5 command line option to turn on shell script testing. Option is on by default but can be disabled with --disable-shell-testing.