clang-apply-replacements: Clean up -help and -version

Options that leak from other parts of LLVM are now pruned out of -help.

-version output is specific to clang-apply-replacements now.

Differential Revision: http://llvm-reviews.chandlerc.com/D1747



git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@191322 91177308-0d34-0410-b5e6-96231b3b80d8