add call support to route-maps

vyos.conf.j2

@@ -1345,6 +1345,9 @@ policy {
                 {{ group['on-match'] }}
             }
             {% endif %}
+            {% if 'call' in group %}
+            call {{ group['call'] }}
+            {% endif %}
             {% if 'continue' in group %}
             continue {% if group['continue'] == 'next' %}{{ loop.index+1 }}{% else %}{{ group['continue'] }}{% endif %}
             {% endif %}