so that one should use:
swh vault rpc-server
as in other swh packages.
The deprecated swh-vault command should still work as expected.
Also improve config file loading behavior as well as the help for this.
Resulting help msg looks like:
$ swh vault rpc-serve -h Usage: swh vault rpc-serve [OPTIONS] Software Heritage Vault RPC server. If the CONFIGFILE option is not set, the default config file search will be used; first the SWH_CONFIG_FILENAME environment variable will be checked, then the config file will be searched in: - ~/.config/swh/vault/server(.yml|.ini) - ~/.swh/vault/server(.yml|.ini) - /etc/softwareheritage/vault/server(.yml|.ini) Options: -C, --config-file CONFIGFILE Configuration file. --no-stdout Do NOT output logs on the console --host HOST Host to run the server --port PORT Binding port of the server --debug / --no-debug Indicates if the server should run in debug mode -h, --help Show this message and exit.