travis: Add clang-format verions output to travis
travis: Add clang-format verions output to travis

Updated `.travis.yml` to output the clang-format version
before running a clang-format check.

Updated `check_code_format.sh` to include a suggestion
to check the user's clang-format version if an error occures.

Change-Id: I4328350cedb27998bd84a3d675eab51c89fb1a9e

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools