Merge isisd into the Quagga's framework:
  - add privs support
  - use misc quagga's definitions
  - make it compile"able"
  - fix segfault cases related to hostname()
  - add debug isis xxx command

This patch has been approved by Paul Jakma.
diff --git a/isisd/isis_dynhn.c b/isisd/isis_dynhn.c
index 9e151d0..0ba1842 100644
--- a/isisd/isis_dynhn.c
+++ b/isisd/isis_dynhn.c
@@ -117,7 +117,7 @@
 	     VTY_NEWLINE);
   }
   
-  vty_out (vty,  "     * %s %s%s", sysid_print (isis->sysid), host.name, 
+  vty_out (vty,  "     * %s %s%s", sysid_print (isis->sysid), unix_hostname(), 
 	   VTY_NEWLINE);
   return;
 }