test/evp_test.c: don't misuse pkey_test_ctrl() in mac_test_run()

test/evp_test.c: don't misuse pkey_test_ctrl() in mac_test_run()

pkey_test_ctrl() was designed for parsing values, not for using in
test runs.  Relying on its returned value when it returned 1 even for
control errors made it particularly useless for mac_test_run().

Here, it gets replaced with a MAC specific control function, that
parses values the same way but is designed for use in a _run() rather
than a _parse() function.

This uncovers a SipHash test with an invalid control that wasn't
caught properly.  After all, that stanza is supposed to test that
invalid control values do generate an error.  Now we catch that.

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7500)