openldap security and bug fix update

[2.4.23-26]

• fix: MozNSS CA cert dir does not work together with PEM CA cert file (#818844)
• fix: memory leak: def_urlpre is not freed (#816168)
• fix update: Default SSL certificate bundle is not found by openldap library (#742023)
  [2.4.23-25]
• fix update: Default SSL certificate bundle is not found by openldap library (#742023)
  [2.4.23-24]
• fix update: Default SSL certificate bundle is not found by openldap library (#742023)
• fix: memberof overlay on the frontend database causes server segfault (#730745)
  [2.4.23-23]
• security fix: CVE-2012-1164: assertion failure by processing search queries
  requesting only attributes for particular entry (#813162)
  [2.4.23-22]
• fix: libraries leak memory when following referrals (#807363)
  [2.4.23-21]
• fix: ldapsearch crashes with invalid parameters (#743781)
• fix: replication (syncrepl) with TLS causes segfault (#783445)
• fix: openldap server in MirrorMode sometimes fails to resync via syncrepl (#784211)
• use portreserve to reserve LDAPS port (636/tcp+udp) (#790687)
• fix: missing options in manual pages of client tools (#745470)
• fix: SASL_NOCANON option missing in ldap.conf manual page (#732916)
• fix: slapd segfaults when certificate key cannot be loaded (#796808)
• Jan Synacek
  • fix: overlay constraint with count option work bad with modify operation (#742163)
  • fix: Default SSL certificate bundle is not found by openldap library (#742023)
  • fix: Duplicate close() calls in OpenLDAP (#784203)