Actually making the clang format test properly fail sanity.

Add ability to control the verbosity of stress test logs

Fix building submodules at head

Add a test to ensure public core headers are C89

Switch to using C99 types for fixed size integers

- ensure failure propogates through run_jenkins.sh
- don't try to regenerate projects on non-linux environments

Add ability to update submodules before build

Update async write documentation

Remove ceiling on required protobuf version

Make possible lossy conversion explicit.

Add tox to Python build-from-source instructions.

Copyright  checker fixes

Add Cython files to check_copyright.py

remove stream from stalled_by_transport list before destroy it

fix one use of unreachable macro

Added exception handling for ImportError

Update copyrights