improvement: change ciphers to current bettercrypto recommendations

this also follow the current test suite we use for hardening minus the GCM-ciphers which will be removed

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
Merge pull request #2 from TelekomLabs/bettercrypto

improvement: change ciphers to current bettercrypto recommendations