Do not use relay_file_operations directly.

Do not use relay_file_operations directly.

Reference counting is important to avoid removing the module while the
file exposing relay channel is being used. SystemTap alone does not need
it, but malicious user may block reloading the module by opening such
file and stap user won't notice it during unloading.

relay_file_operations defined and exported in kernel/relay.c is const
and .owner is obviously not set there, hence it shouldn't be used
directly by any kernel module.

Add relay_file_operations_w_owner and use it instead of mentioned one to
fix 'trace' file handling w.r.t. module unloading.

* runtime/transport/relay_v2.c: Add owner to the trace file.