ospf6-topo1: Don't compare link-local routes

ospf6-topo1: Don't compare link-local routes

Topotests would fail with errors like these:

    AssertionError: Linux Kernel IPv6 Routing Table verification failed for router r1:
      --- actual OSPFv3 IPv6 routing table
      +++ expected OSPFv3 IPv6 routing table
      @@ -8,6 +8,6 @@
       fc00:4:4:4::/64 via fe80::__(r3-sw5)__ dev r1-sw5 proto XXXX metric 20 pref medium
       fc00:a:a:a::/64 dev r1-sw5 proto XXXX metric 256 pref medium
       fc00:b:b:b::/64 via fe80::__(r3-sw5)__ dev r1-sw5 proto XXXX metric 20 pref medium
      -fe80::/64 dev lo proto XXXX metric 256 pref medium
       fe80::/64 dev r1-stubnet proto XXXX metric 256 pref medium
      -fe80::/64 dev r1-sw5 proto XXXX metric 256 pref medium
      +fe80::/64 dev r1-sw5 proto XXXX metric 256 pref medium
      +unreachable fe80::/64 dev lo proto XXXX metric 256 error -101 pref medium

Resolve this by not comparing link-local routes.

Signed-off-by: Christian Franke <chris@opensourcerouting.org>