[FFe] Update to 2.4.18

2.4.18 supports disconnected mode for the pcache overlay which was discussed at UDS and part of the server-karmic-directory-enabled-user-login specification:

 Fixed slapo-pcache multiple enhancements (ITS#6152,ITS#5178)

https://blueprints.launchpad.net/ubuntu/+spec/server-karmic-directory-enabled-user-login

Here is the full upstream changelog:

OpenLDAP 2.4.18 Release (2009/09/06)
 Fixed client tools common options (ITS#6049)
 Fixed liblber speed and other problems (ITS#6215)
 Added libldap MozNSS PEM support (ITS#6278)
 Added libldap option for SASL_USERNAME (ITS#6257)
 Fixed libldap error parsing (ITS#6197)
 Fixed libldap native getpass usage (ITS#4643)
 Fixed libldap tls_check_hostname for OpenSSL and MozNSS (ITS#6239)
 Added slapd tcp buffers support (ITS#6234)
 Fixed slapd allow mirrormode to be set to FALSE (ITS#5946)
 Fixed slapd certificate list parsing (ITS#6241)
 Fixed slapd writers blocking (ITS#6276)
 Fixed slapd dncachesize behavior to unlimited by default (ITS#6222)
 Fixed slapd incorrectly applying writetimeout when not set (ITS#6220)
 Fixed slapd with duplicate empty lines for olcDbConfig (ITS#6240)
 Fixed slapd server URL matching (ITS#5942)
 Fixed slapd subordinate needs a suffix (ITS#6216)
 Fixed slapd syncrepl decrement on possible NULL value (ITS#6256)
 Fixed slapd tools to properly close database (ITS#6214)
 Fixed slapd uninitialized SlapReply components (ITS#6101)
 Fixed slapd-meta starttls with targets (ITS#6190)
 Fixed slapd-monitor stats with glued subordinates (ITS#6243)
 Fixed slapd-ndb startup (ITS#6203)
 Fixed slapd-relay various issues (ITS#6133)
 Fixed slapd-relay response/cleanup callback mismatch (ITS#6154)
 Fixed slapd-sql with baseObject query (ITS#6172)
 Fixed slapd-sql with empty attribute (ITS#6163)
 Fixed slapo-dynlist uninitialized var (ITS#6266)
 Fixed slapo-pcache multiple enhancements (ITS#6152,ITS#5178)
 Fixed slapo-ppolicy updating operational attributes (ITS#6265)
 Fixed slapo-translucent attribute return (ITS#6254)
 Fixed slapo-translucent filter matching (ITS#6255)
 Fixed slapo-translucent to honor sizelimit (ITS#6253)
 Fixed slapo-unique filter matching (ITS#6077)
 Fixed tools off by one error (ITS#6233)
 Fixed tools resource leaks (ITS#6145)
 Added contrib/allowed (ITS#4730)
 Fixed contrib/autogroup with RE24 (ITS#6227)
 Fixed contrib/nss symbols (ITS#6273)
 Build Environment
  Tests note which backend is being tested (ITS#5810)
  Fixed test056-monitor with custom ports (ITS#6213)
 Documentation
  admin24 fix broken link (ITS#6264)
  ldap_open(3) document URI (ITS#6261)

The package builds correctly as well as installs and upgrades correctly. The upstream test suite is run during the build process.