nft_flowtable.sh selftest failures

[Paolo Abeni <pabeni@redhat.com>]

Hi,

the mentioned self test failed in the last 2 CI iterations, on both
metal and debug build, with the following output:

# PASS: flow offload for ns1/ns2 with dnat and pmtu discovery ns1 <- ns2
# Error: Requested AUTH algorithm not found.
# Error: Requested AUTH algorithm not found.
# Error: Requested AUTH algorithm not found.
# Error: Requested AUTH algorithm not found.
# FAIL: file mismatch for ns1 -> ns2
# -rw------- 1 root root 2097152 Aug 11 20:23 /tmp/tmp.x1oVr3mu0P
# -rw------- 1 root root 0 Aug 11 20:23 /tmp/tmp.77gElv9oit
# FAIL: file mismatch for ns1 <- ns2
# -rw------- 1 root root 2097152 Aug 11 20:23 /tmp/tmp.x1oVr3mu0P
# -rw------- 1 root root 0 Aug 11 20:23 /tmp/tmp.ogDiTh8ZXf
# FAIL: ipsec tunnel mode for ns1/ns2

see, i.e.:
https://netdev-3.bots.linux.dev/vmksft-nf/results/249461/14-nft-flowtable-sh/

I don't see relevant patches landing in the relevant builds, I suspect
the relevant kernel config knob (CONFIG_CRYPTO_SHA1 ?) was always
missing in the ST config, pulled in by NIPA due to some CI setup tweak
possibly changed recently (Jakub could possibly have a better idea/view
about the latter). Could you please have a look?

NIPA generates the kernel config and the kernel build itself with
something alike:

rm -f .config
vng --build  --config tools/testing/selftests/net/forwarding/config

/P