Security update for openldap2 (important)

This update fixes the following security issues:

• CVE-2015-6908: The ber_get_next function allowed remote attackers to
  cause a denial
  of service (reachable assertion and application crash) via crafted BER
  data, as demonstrated by an attack against slapd. (bsc#945582)
• CVE-2015-4000: Fix weak Diffie-Hellman size vulnerability. (bsc#937766)

It also fixes the following non-security bugs:

• bsc#955210: Unresponsive LDAP host lookups in IPv6 environment

This update adds the following functionality:

• fate#319300: SHA2 password hashing module that can be loaded on-demand.

This update was imported from the SUSE:SLE-12:Update update project.