Corresponds to the teamd runner.name.
Permitted values are: "roundrobin", "broadcast", "activebackup",
-"loadbalance", "lacp".
+"loadbalance", "lacp".
+When setting the runner, all the properties specific to the runner
+will be reset to the default value; all the properties specific to
+other runners will be set to an empty value (or if not possible to
+a default value).