r26419: Add a module to implement 'ambigious name resolution' by munging the

r26419: Add a module to implement 'ambigious name resolution' by munging the

incoming LDAP filter.

Warning: Any anr search will perform a full index search.  Untill ldb
gets substring indexes, this is unavoidable.

Also implement a testsutie to show we match AD behaviour for this
important extension (used in the Active Directory Users and Computers
MMC plugin, as a genereral 'find').

This will also be useful to OpenChange, as their server needs to
implement this.

Andrew Bartlett