A new ACL type, ldap-attr (Wallet::ACL::LDAP::Attribute), is now
supported.  This ACL type grants access if the LDAP entry
corresponding to the principal contains the attribute name and value
specified in the ACL.  The Net::LDAP and Authen::SASL Perl modules are
required to use this ACL type.  New configuration settings are
required as well; see Wallet::Config for more information.  To enable
this ACL type for an existing wallet database, use wallet-admin to
register the new verifier.