Don't expect the net/carp/t_basic/carp_handover_ipv6_halt_nocarpdevip
and carp_handover_ipv6_ifdown_nocarpdevip test cases to fail. At
least on the TNF i386 and amd64 testbeds, they pass more often

Don't expect the net/carp/t_basic/carp_handover_ipv6_halt_nocarpdevip
and carp_handover_ipv6_ifdown_nocarpdevip test cases to fail. At
least on the TNF i386 and amd64 testbeds, they pass more often than
not since the commit of src/sys/netinet/ip_carp.c 1.119 by mlelstv on
2023.04.07.06.44.08.

show more ...

tests: use rump_server_add_iface to create interfaces

Clean up clunky eval strings

- Remove unnecessary \ at EOL
- This allows to omit ; too
- Remove unnecessary quotes for arguments of atf_set
- Don't expand $DEBUG in eval
- We expect it's expande

Clean up clunky eval strings

- Remove unnecessary \ at EOL
- This allows to omit ; too
- Remove unnecessary quotes for arguments of atf_set
- Don't expand $DEBUG in eval
- We expect it's expanded on execution

Suggested by kre@

show more ...

Test CARP handover on setups without having IPs on carpdev (shmif)

Note that tests for IPv6 don't pass yet; nd6 needs to handle CARP
correctly like arp does.

Reduce duplicated codes (DRY)

Make CARP on IPv6 work

It passes ATF tests but no more, no less.

Test handovers on interface down as well as server halt

Add a test case for CARP on IPv6

The test case fails expectedly because the implementation of CARP on IPv6
is incomplete yet.

Rewrite tests for CARP in a shell script instead of C

The new shell script enables us to modify/add tests easily.