Tidy up the list of auth and encryption algorithms for IPsec stats.

• Use keyed-md5 and keyed_sha1 instead of md5 and sha1 to match the names accepted by setkey and to also avoid confusion since these are not "plain" MD5 or SHA1.
• Remove always-true #ifdef's to make the source a bit easier to read.
• Add missing mappings for tcp-md5, camellia-cbc, and aes-gmac.

MFC after: 2 weeks
Sponsored by: Chelsio Communications