(ITS#5614) Ignore invalid search filters

[andrew.graham@agustawestland.com]

Full_Name: Andrew Graham
Version: 2.4.10
OS: SLES 10
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (194.169.32.250)


In line with the behavious specified in ITS 3785, any invalid search filter
applied against back-meta will force a query including the search filter
(!(objectClass=*)). As this filter can result in slow performance for certain
brands of LDAP server, please provide an option to ignore invalid search filters
in back-meta.