b3874bf958
Implemented a 'sasl' auth_type for better control over authentication flow specific to SASL. Implemented 'sasl_dn_regex' and 'sasl_dn_replacement' config variables for mapping from a SASL authentication ID to a bind DN, a necessary step when using GSSAPI/Kerberos where there is no explicit bind DN provided. Fixed setting of Kerberos credentials cache location in environment variable. The location is derived from either an already set environement variable or the SERVER variable set by the Apache mod_auth_kerb module. See http://modauthkerb.sourceforge.net/configure.html