Bird handles OpenBSD route priority differently

[Igor Podlesny]

(compared to native OSPF daemon.)

Test lab: just two routers with OSPF on both: A and B.
OpenBSD 6.4. Bird 1.6.4p1.

Router A has two default routes installed:

Routing tables

Internet:
Destination        Gateway            Flags   Refs      Use   Mtu  Prio Iface
default            192.168.69.36      UGS        0      353     -     8 vio0
default            192.168.69.37      UGS        0        0     -    12 vio0

bird> show ospf state all

area 0.0.0.0

router 192.168.69.34
distance 0
network 192.168.69.32/29 metric 10
external 0.0.0.0/0 metric2 10000 via 192.168.69.37
external 192.168.69.32/29 metric2 10000

Higher priority 12 is of a lesser significance, so kernel prefers
default via .36.
Trying OpenOSPFd it's seen that theirs OSPF also prefers default via
.36 in its advertisements.

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