selftests: netfilter: nft_fib.sh: add 'type' mode tests

selftests: netfilter: nft_fib.sh: add 'type' mode tests

fib can either lookup the interface id/name of the output interface that
would be used for the given address, or it can check for the type of the
address according to the fib, e.g. local, unicast, multicast and so on.

This can be used to e.g. make a locally configured address only reachable
through its interface.

Example: given eth0:10.1.1.1 and eth1:10.1.2.1 then 'fib daddr type' for
10.1.1.1 arriving on eth1 will be 'local', but 'fib daddr . iif type' is
expected to return 'unicast', whereas 'fib daddr' and 'fib daddr . iif'
are expected to indicate 'local' if such a packet arrives on eth0.

So far nft_fib.sh only covered oif/oifname, not type.

Repeat tests both with default and a policy (ip rule) based setup.

Also try to run all remaining tests even if a subtest has failed.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>