List ChaCha20-Poly1305 as stream cipher

List ChaCha20-Poly1305 as stream cipher

As Antonio pointed out, "8-bit block cipher" is a bit funny. So teach
print_cipher() to print such cipher as "stream cipher".

Because I didn't want to write the same code twice, I decided to merge the
two print_cipher() implementations into one shared function. That should
make it easier to keep both backends consistent.

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Antonio Quartulli <antonio@openvpn.net>
Message-Id: <20181009204315.8262-1-steffan@karger.me>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg17682.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>