Package openldap-contrib: Information

Various overlays found in contrib/:
 * addpartial    Intercepts ADD requests, applies changes to existing entries
 * allop
 * allowed       Generates attributes indicating access rights
 * autogroup
 * authzid       implements RFC 3829 support
 * cloak
 * datamorph     store enumerated values and fixed size integers
 * denyop
 * lastbind      writes last bind timestamp to entry
 * noopsrch      handles no-op search control
 * pw-sha2       generates/validates SHA-2 password hashes
 * pw-pbkdf2     generates/validates PBKDF2 password hashes
 * smbk5pwd      generates Samba3 password hashes (heimdal krb disabled)
 * trace         traces overlay invocation
 * usn           usnCreated and usnChanged operational attributes
 * variant       allows attributes/values to be shared between several entries
 * vc            implements the verify credentials extended operation