Limit the output of the enc -ciphers command to just the ciphers enc can

process.  This means no AEAD ciphers and no XTS mode.

Update the test script that uses this output to test cipher suites to not
filter out the now missing cipher modes.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2876)