Security update for samba (important)

This update for samba fixes the following issues:

Security issues fixed:

• CVE-2017-2619: Symlink race permits opening files outside share
  directory (bsc#1027147).

Bugfixes:

• Don’t package man pages for VFS modules that aren’t built (bsc#993707).
• sync_req: make async_connect_send() "reentrant"; (bso#12105);
  (bsc#1024416).
• Document "winbind: ignore domains" parameter; (bsc#1019416).
• Prevent core, make sure response->extra_data.data is always cleared out;
  (bsc#993692).