When giving up PIT entry, remove all outgoing interests. Otherwise,
everything can stuck (was happening...)

Modified experiment with synthetic topology
diff --git a/examples/synthetic-topology.txt b/examples/synthetic-topology.txt
index 2c080d9..0d175b0 100644
--- a/examples/synthetic-topology.txt
+++ b/examples/synthetic-topology.txt
@@ -1,20 +1,29 @@
 router
 #name	city	latitude	longitude
-NODE1	NODE1	60		20
-NODE2	NODE2	20		20
-NODE3	NODE3	40		40
-NODE4	NODE4	20		60
-NODE5	NODE5	40		80
-NODE6	NODE6	60  		100
-NODE7	NODE7	20		100
+c1	NODE1	50		30
+c2	NODE2	30		30
+c3	x	10		30
+n1	NODE3	40		40
+n12	NODE4	30		60
+n2	NODE5	40		80
+p1	NODE6	50  		90
+p2	NODE7	30		90
+p3	x	10		90
+c4	x	10		40
+p4	x	10		80
 link
 #capacity on 4/10/2003 (see page 20 of http://www.internet2.edu/presentations/spring03/20030410-Abilene-Corbato.pdf)
 #OSPF weight on 04/10/2003 (see http://www.abilene.iu.edu/images/Ab-IGP-topo.jpg)
-#x	y	capacity(kbps)	OSPF    Delay   QueueSize1	QueueSize2
-NODE1	NODE3	10Mbps 		1 	1  	150  	    	150
-NODE2	NODE3	10Mbps 		1 	1   	150 	    	150
-NODE3	NODE4	1Mbps 		1176   	1   	15  		15
-NODE3	NODE5	1Mbps 		587    	1   	15  		15
-NODE4	NODE5	1Mbps 		846    	1   	15  		15
-NODE5	NODE6	10Mbps 		260   	1   	150		150
-NODE5	NODE7	10Mbps 		700   	50  	150		150
+#x	y	capacity(kbps)	OSPF    Delay		MaxPackets
+c1	n1	10Mbps 		1 	1ms  		200
+c2	n1	10Mbps 		1 	1ms   		200
+c3	n1	10Mbps		1	1ms		200
+n1	n2	1Mbps 		1176   	1ms   		20 
+n1	n12	1Mbps 		587    	1ms   		20
+n12	n2	1Mbps 		846    	1ms   		20
+n2	p1	10Mbps 		260   	50ms   		200
+n2	p2	10Mbps 		700   	1ms  		200
+n2	p3	10Mbps		1	1ms		200
+c4	n1	10Mbps		1	1ms		200
+n2	p4	10Mbps		1	1ms		200
+