Remove "auth" configs from default records.config (LDAP, NTLM etc.)

These serve no purpose, and are just confusing, e.g.

CONFIG proxy.config.ldap.auth.enabled INT 0
CONFIG proxy.config.radius.auth.enabled INT 0

etc. I'm going to remove them from records.config, but leaving 'em in RecordsConfig.cc, for if/when we reintroduce auth. If we ever need to restore records.config, we can just undo the patches attached to this bug.