Security update for samba (important)

This update for Samba fixes the following security issues:

• CVE-2015-5330: Remote read memory exploit in LDB (bnc#958586).
• CVE-2015-5252: Insufficient symlink verification (file access outside
  the share) (bnc#958582).
• CVE-2015-5296: No man in the middle protection when forcing smb
  encryption on the client side (bnc#958584).
• CVE-2015-5299: Currently the snapshot browsing is not secure thru
  windows previous version (shadow_copy2) (bnc#958583).

Non-security issues fixed:

• Prevent null pointer access in samlogon fallback when security
  credentials are null (bnc#949022).
• Address unrecoverable winbind failure: "key length too large"
  (bnc#934299).
• Take resource group sids into account when caching netsamlogon data
  (bnc#912457).
• Use domain name if search by domain SID fails to send SIDHistory lookups
  to correct idmap backend (bnc#773464).
• Remove deprecated base_rid example from idmap_rid manpage (bnc#913304).
• Purge printer name cache on spoolss SetPrinter change (bnc#901813).
• Fix lookup of groups with "Local Domain" scope from Active Directory
  (bnc#948244).