Security update for samba (important)

This update for samba fixes the following issues:

The following security vulnerability was fixed:

• CVE-2018-10858: Fixed insufficient input validation on client directory
  listing in libsmbclient; (bsc#1103411);

The following other change was made:

• s3: winbind: Fix ‘winbind normalize names’ in wb_getpwsid();
• winbind: honor "winbind use default domain" with empty domain
  (bsc#1087303)
• winbind: do not modify credentials in NTLM passthru (bsc#1068059)
• net: fix net ads keytab handling (bsc#1067700)
• fix vfs_ceph flock stub

This update was imported from the SUSE:SLE-12-SP3:Update update project.