Fix for TSAN build failing repeatedly

Fix for failing to start binaries on mac

Spec improvements

Overhaul benchmark control protos and tests themselves

Removed consts to make MSVC happy

Fixes grpc/grpc-common#273

Fixes grpc/grpc-common#257

This fixes grpc/grpc-common#185

This fixes grpc/grpc-common#205

The pretty quotes were automatically converted from ASCII quotes when
the documented was a Google Doc. Now they just make modifying the
document harder.

None of them were causing display problems online, but it would be easy
for them to start causing trouble.

Make payloads respect the new defaults

Define resultset.

Added grpc_byte_buffer_reader_readall

Coverage improvements

Enable reasonable default if resp size not specified

Move static value grpc::string_ref::npos definition to cc file