Refactor and unify ssl_tls_clienthello_identify() and the earlier
ssl_tls_clienthello_parse_sni() into a single
ssl_tls_clienthello_parse() function that handles parsing ClientHello
messages for different purposes. As a result, rename the debug knob
DEBUG_SNI_PARSER into DEBUG_CLIENTHELLO_PARSER.
- Update copyright to 2015
- Remove the non-standard "unmodified" from the 2-clause BSD license
- Remove scalable from the tagline to avoid misinterpretations