(ITS#4935) SASL_MAX_BUFF_SIZE is too small

[lukeh@novell.com]

Full_Name: Luke Howard
Version: 2.3.32
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (125.16.129.17)


SASL_MAX_BUFF_SIZE is too small for SASL mechanisms, such as GSS-SPNEGO, that
use a buffer size unconstrained by the 64K limit defined for some mechanisms in
RFC 2222.

A more reasonable default would 0xFFFFFF (2^24), used as the maximum buffer size
by many of the mechanisms shipped with Cyrus itself.