add showconf in RNDC usage

The `rndc -h` command was missing the newly introduced `showconf`
commands. Adding it.

diff --git a/bin/rndc/rndc.c b/bin/rndc/rndc.c
index 46d0aa0c97cadd16588e0a7f242c9566dadab9f5..66660351ba1502ed1b1f1fdcc1fe9ab4ff99ce2e 100644 (file)
--- a/bin/rndc/rndc.c
+++ b/bin/rndc/rndc.c
@@ -184,6 +184,8 @@ command is one of the following:\n\
                Write security roots to the secroots file.\n\
   serve-stale [ on | off | reset | status ] [class [view]]\n\
                Control whether stale answers are returned\n\
+  showconf ( -user | -builtin | -effecive )\n\
+               Print the current configuration for the server.\n\
   showzone zone [class [view]]\n\
                Print a zone's configuration.\n\
   sign zone [class [view]]\n\