Improve gen_reflection_proto.sh

Set default max send message size to unlimited.

Add comments documenting ownership semantics

Remove unused files.

Rewrote handling of default resolver prefix

Changed deadline of internal LB channel.

Reduce load on Jenkins from running benchmarks as tests

Add a header to override grpc::string when needed

Prevent some compilers compaining unused return value

HTTP CONNECT handshaker

It used to be 3 seconds for no good reason. The correct value would come
from the parent channel. Until that's easy to accomplish, it's been
changed to "infinite".

More known errors. Mostly on macos.

Update .gitmodules

Fix Android + CPP build

Tag "3.0.0-GA" does not exist anymore.

https://github.com/grpc/grpc/issues/7997

Updated LB service name in grpclb

Properly init variable

Extend sweeps further, add streaming

PHP: use real artifact name in jenkins test