initctl: ensure 'cond get' support flux state

The 'initctl cond' commands were initiallý added to only manage usr
conditions.  Recently the 'cond get' command was expanded to allow
reading general conditions as well.

However, since general conditions support three states the command
returned 'on' for conditions that were in flux.  This patch fixes
that oversight.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

man/initctl.8

@@ -139,11 +139,10 @@ or
 then any condition can be read.
 .Pp
 The command is geared for scripting, check the exit code to get the
-status of the condition, or give
-.Nm
-the
+status of the condition: 0 - off, 1 - on, 255 - flux.  For a more
+verbose output, use the
 .Fl v
-option for a more verbose output.
+option.
 .It Nm Ar cond clr | clear Ar COND Op COND ...
 Clear (deassert) user-defined condition,
 .Cm -usr/COND