QUERY_LOGOUT_ACTION: Query which logout actions are possible
Only supported on connections that passed AUTH_LOCAL.
Supported since: 2.5.90.0
Answers:
OK <action>;<action>;...
Where action is one of HALT, REBOOT or SUSPEND.  An
empty list can also be returned if no action is possible.
A '!' is appended to an action if it was already set with
SET_LOGOUT_ACTION or SET_SAFE_LOGOUT_ACTION.  Note that
SET_LOGOUT_ACTION has precedence over
SET_SAFE_LOGOUT_ACTION.
ERROR <err number> <english error description>
0 = Not implemented
100 = Not authenticated
200 = Too many messages
999 = Unknown error
