[openssl/openssl] bio_dgram vs IPv6

[Michael Richardson]

The clang-9 test fails with:

        # ERROR:  @ test/bio_dgram_test_helpers.c:150
        # failed to v6 bind socket: Permission denied
        #
        #
        # OPENSSL_TEST_RAND_ORDER=1648577511
        not ok 2 - iteration 1

https://github.com/mcr/openssl/runs/5741887864?check_suite_focus=true

The other clang-XX tests seem to run fine.
This smells like the problem with TRAVIS where IPv6 was not enabled in the
Google VMs, but we aren't using those anymore.

It does not bind specific sockets (lets kernel choose), so there shouldn't a
conflict between test cases.  Anyway, if that were the case, I'd expect to
see in-use error rather than permission denied.

Smells to me like someone has restricted network sockets in order to avoid
being used as an attack system.



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