Add real factotum.

libauth/auth_attr.c

@@ -0,0 +1,13 @@
+#include <u.h>
+#include <libc.h>
+#include <auth.h>
+#include <authsrv.h>
+#include "authlocal.h"
+
+Attr*
+auth_attr(AuthRpc *rpc)
+{
+	if(auth_rpc(rpc, "attr", nil, 0) != ARok)
+		return nil;
+	return _parseattr(rpc->arg);
+}