Optimizer was spotting that src1 and src2 would be identical and merging
them.

See this error (somehow triggered by a new version of boringssl):
https://grpc-testing.appspot.com/job/gRPC_pull_requests_msan_c/1154/testReport/junit/(root)/c_linux_msan/bins_msan_handshake_client_GRPC_POLL_STRATEGY_poll_cv/
In the alpn callback, in_len is the size of the in buffer and not the number of alpn elements.

memory usage profiling for client call, client channel, server creation, server call and server channel.

fix bug. server: snapshot pass by pointer

setting channel args --draft

clang-format

Not kill the server on disconnect
Spawn one server per test case