Include the destination net in the policy priority calculation.

Include the destination net in the policy priority calculation.

The resulting priorities are as follows:

    IPv6               IPv4
    routed   normal    routed   normal
max 4096(+3) 2048(+3)  4096(+3) 2048(+3)
min 3072     1024      3840     1792

Where min is for a policy between two single hosts and max is
for /0 on both ends (lower priorities are preferred by the kernel).
(+3) applies for cases where no protocol and no ports are defined.