ldomctl(8) usage

[Stefan Sperling]

I am not sure about the best way to fix this, but ldomctl's usage()
is rather bogus. It only mentions some of the supported commands.
The diff below adds the missing ones.

However, I am tempted to just change all of it to something like this:
        fprintf(stderr, "usage: ldomctl command [arguments]\n");
and let people refer to the man page instead.

Is this worth bikeshedding about?

Index: ldomctl.c
===================================================================
RCS file: /cvs/src/usr.sbin/ldomctl/ldomctl.c,v
retrieving revision 1.20
diff -u -p -r1.20 ldomctl.c
--- ldomctl.c   9 Oct 2014 02:44:55 -0000       1.20
+++ ldomctl.c   26 Jan 2017 11:16:30 -0000
@@ -161,6 +161,11 @@ usage(void)
 
        fprintf(stderr, "usage: %s start|stop|panic domain\n", __progname);
        fprintf(stderr, "       %s status [domain]\n", __progname);
+       fprintf(stderr, "       logical domain configuration:\n", __progname);
+       fprintf(stderr, "       %s list|dump\n", __progname);
+       fprintf(stderr, "       %s select|delete configuration\n", __progname);
+       fprintf(stderr, "       %s download directory\n", __progname);
+       fprintf(stderr, "       %s init-system file\n", __progname);
        exit(EXIT_FAILURE);
 }