reuse reqid when a ROUTED child_sa gets INSTALLED

fixed a bug in retransmission code
added support for the "keyingtries" ipsec.conf parameter
added support for the "dpddelay" ipsec.conf parameter
done some work for "dpdaction" behavior
some other cleanups and fixes

src/stroke/stroke.c

@@ -116,6 +116,9 @@ static int add_connection(char *name,
 	msg.add_conn.algorithms.ike = NULL;
 	msg.add_conn.algorithms.esp = NULL;
 	
+	msg.add_conn.dpd.delay = 0;
+	msg.add_conn.dpd.route = 0;
+	
 	msg.add_conn.me.id = push_string(&msg, my_id);
 	msg.add_conn.me.address = push_string(&msg, my_addr);
 	msg.add_conn.me.subnet = push_string(&msg, my_net);

src/stroke/stroke.h

@@ -145,6 +145,10 @@ struct stroke_msg_t {
 				unsigned long tries;
 				unsigned long fuzz;
 			} rekey;
+			struct {
+				time_t delay;
+				bool route;
+			} dpd;
 			stroke_end_t me, other;
 		} add_conn;