Merge branch 'propagate' of github.com:ctiller/grpc into propagate

include/grpc/grpc.h

src/core/surface/call.c

src/core/surface/call.h

src/core/surface/channel.c

src/csharp/ext/grpc_csharp_ext.c

src/php/ext/grpc/call.c

src/python/grpcio/grpc/_adapter/_c/types/channel.c

src/ruby/ext/grpc/rb_channel.c

test/core/end2end/dualstack_socket_test.c

test/core/end2end/no_server_test.c

test/core/end2end/tests/bad_hostname.c

test/core/end2end/tests/cancel_after_accept.c

...ore/end2end/tests/cancel_after_accept_and_writes_closed.c

test/core/end2end/tests/cancel_after_invoke.c

test/core/end2end/tests/cancel_before_invoke.c

test/core/end2end/tests/cancel_in_a_vacuum.c

test/core/end2end/tests/census_simple_request.c

test/core/end2end/tests/disappearing_server.c

...end/tests/early_server_shutdown_finishes_inflight_calls.c

test/core/end2end/tests/empty_batch.c