MEDIUM: config: add the 'ssl' keyword on 'bind' lines

"bind" now supports "ssl" followed by a PEM cert+key file name.
diff --git a/src/haproxy.c b/src/haproxy.c
index 5d537df..764e30f 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -993,6 +993,9 @@
 			l_next = l->next;
 			unbind_listener(l);
 			delete_listener(l);
+#ifdef USE_OPENSSL
+			free(l->ssl_cert);
+#endif
 			free(l->name);
 			free(l->counters);
 			free(l);