routing-helper: fix route computation bug

Route computation for link-state had a bug, neighbor's list
contained the host itself and so the computation was erroneous,
and ultimately crashing.

Change-Id: I461476eef83b73b64ae943f6f08bf576e3719b94

topologies/geo_hyperbolic_test.conf

@@ -0,0 +1,13 @@
+[nodes]
+kisti: _ radius=10.3702985908827 angle=0.716433223334,0.0545806345001
+uum: _ radius=1.6094379124341003 angle=1.67926190756,1.86479930822
+remap: _ radius=6.530877627725885 angle=0.895062959887,6.12377862701
+ntnu: _ radius=1.791759469228055 angle=0.947897043404,2.43808027724
+tongji: _ radius=1.791759469228055 angle=1.17730242215,1.99086740715
+[links]
+kisti:remap delay=20ms
+uum:tongji delay=15ms
+remap:uum delay=13ms
+ntnu:kisti delay=10ms
+tongji:ntnu delay=10ms
+uum:ntnu delay=20ms