* Give a module the possibility to known its own name
This is useful for logging and reporting and fixes the longstanding problem with syslog-messages:
May 30 15:50:11 moria ansible-<stdin>: Invoked with ...
now becomes:
Jun 1 17:32:03 moria ansible-copy: Invoked with ...
This fixes#15830
* Rename the internal name from module.ansible_module_name to module._name