Remove all uses of __FUNCTION__

src/core/httpcli/httpcli.c

src/core/iomgr/sockaddr_utils.c

src/core/surface/server.c

test/core/channel/channel_stack_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

.../core/end2end/tests/early_server_shutdown_finishes_tags.c

test/core/end2end/tests/empty_batch.c

test/core/end2end/tests/graceful_server_shutdown.c

test/core/end2end/tests/invoke_large_request.c

test/core/end2end/tests/max_concurrent_streams.c

test/core/end2end/tests/max_message_length.c

test/core/end2end/tests/no_op.c