[docker] Fix unmatched quote problem in here-document on older versions of bash
Summary:
When outputing usage, emit here-document directly instead of
saving in a variable first -- avoids problem with bash 3.2.57 where an
unmatched ' in the here-document results in the following error:
./build_docker_image.sh: line 135: unexpected EOF while looking for matching `''
bash --version
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin16)
Differential Revision: https://reviews.llvm.org/D36064
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309568
91177308-0d34-0410-b5e6-
96231b3b80d8