Addressing comments.

BUILD

Makefile

build.json

src/core/security/auth.c

src/core/security/security_context.c

src/core/security/security_context.h

test/core/end2end/gen_build_json.py

tools/run_tests/tests.json

vsprojects/grpc/grpc.vcxproj

vsprojects/grpc/grpc.vcxproj.filters