vty: Support multi-char separators and end strings
In vty_cmd_string_from_valstr() include the real string lengths of
the sep and end arguments into the buffer size calculation.
diff --git a/tests/vty/vty_test.ok b/tests/vty/vty_test.ok
index 9ff68c8..baec249 100644
--- a/tests/vty/vty_test.ok
+++ b/tests/vty/vty_test.ok
@@ -1,3 +1,3 @@
Going to test vty_cmd_string_from_valstr()
-Tested with %s-strings, resulting cmd = '[prefix%s%s%s%s%s][foo%s%s%s%s%s][sep%s%s%s%s%s]['
+Tested with %s-strings, resulting cmd = '[prefix%s%s%s%s%s][foo%s%s%s%s%s][sep%s%s%s%s%s][bar%s%s%s%s%s][end%s%s%s%s%s]'
All tests passed