COMP: Make initial HDF5 discovery of 1.8.16 quiet.
COMP: Make initial HDF5 discovery of 1.8.16 quiet.

Avoid the warning:

CMake Warning at Modules/ThirdParty/HDF5/itk-module-init.cmake:7 (find_package):
  Could not find a package configuration file provided by "HDF5" with any of
  the following names:

    HDF5Config.cmake
    hdf5-config.cmake

  Add the installation prefix of "HDF5" to CMAKE_PREFIX_PATH or set
  "HDF5_DIR" to a directory containing one of the above files.  If "HDF5"
  provides a separate development package or SDK, be sure it has been
  installed.

when HDF5 1.8.15 or lower is installed.

Change-Id: Ie7a5dac8da8d3e85c62cc01c8d5a8ed5f18f5d93

vfonov/ITK,malaterre/ITK,fbudin69500/ITK,richardbeare/ITK,spinicist/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,vfonov/ITK,fbudin69500/ITK,BRAINSia/ITK,hjmjohnson/ITK,malaterre/ITK,malaterre/ITK,Kitware/ITK,spinicist/ITK,zachary-williamson/ITK,zachary-williamson/ITK,BRAINSia/ITK,blowekamp/ITK,LucasGandel/ITK,malaterre/ITK,vfonov/ITK,spinicist/ITK,stnava/ITK,LucasGandel/ITK,LucasGandel/ITK,fbudin69500/ITK,PlutoniumHeart/ITK,stnava/ITK,thewtex/ITK,Kitware/ITK,zachary-williamson/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,Kitware/ITK,Kitware/ITK,fbudin69500/ITK,blowekamp/ITK,PlutoniumHeart/ITK,vfonov/ITK,BRAINSia/ITK,stnava/ITK,stnava/ITK,BRAINSia/ITK,blowekamp/ITK,PlutoniumHeart/ITK,malaterre/ITK,PlutoniumHeart/ITK,vfonov/ITK,PlutoniumHeart/ITK,thewtex/ITK,PlutoniumHeart/ITK,malaterre/ITK,hjmjohnson/ITK,PlutoniumHeart/ITK,Kitware/ITK,hjmjohnson/ITK,spinicist/ITK,fbudin69500/ITK,richardbeare/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,stnava/ITK,spinicist/ITK,spinicist/ITK,thewtex/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,malaterre/ITK,blowekamp/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,Kitware/ITK,spinicist/ITK,hjmjohnson/ITK,blowekamp/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,stnava/ITK,blowekamp/ITK,fbudin69500/ITK,hjmjohnson/ITK,vfonov/ITK,PlutoniumHeart/ITK,hjmjohnson/ITK,blowekamp/ITK,LucasGandel/ITK,vfonov/ITK,zachary-williamson/ITK,zachary-williamson/ITK,zachary-williamson/ITK,zachary-williamson/ITK,zachary-williamson/ITK,richardbeare/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,malaterre/ITK,thewtex/ITK,fbudin69500/ITK,richardbeare/ITK,BRAINSia/ITK,LucasGandel/ITK,fbudin69500/ITK,thewtex/ITK,richardbeare/ITK,blowekamp/ITK,stnava/ITK,spinicist/ITK,vfonov/ITK,stnava/ITK,richardbeare/ITK,spinicist/ITK,richardbeare/ITK,LucasGandel/ITK,BRAINSia/ITK,zachary-williamson/ITK