clang-format all source

include/grpc++/async_unary_call.h

include/grpc++/auth_context.h

include/grpc++/byte_buffer.h

include/grpc++/client_context.h

include/grpc++/dynamic_thread_pool.h

include/grpc++/generic_stub.h

include/grpc++/impl/call.h

include/grpc++/impl/grpc_library.h

include/grpc++/impl/serialization_traits.h

include/grpc++/impl/sync_no_cxx11.h

include/grpc++/impl/thd_no_cxx11.h

include/grpc++/server.h

include/grpc++/server_builder.h

include/grpc++/stream.h

include/grpc/grpc.h

include/grpc/status.h

include/grpc/support/alloc.h

include/grpc/support/atm.h

include/grpc/support/atm_gcc_atomic.h

include/grpc/support/atm_gcc_sync.h