Package samba-winbind-clients: Information

- Update to stable release of Samba 4.19
- Fixes from upstream:
  + net changesecretpw cannot set the machine account password if secrets.tdb
    is empty (Samba#13577).
  + Following intermediate abolute share-local symlinks is broken (Samba#15505).
    ctdb RELEASE_IP causes a crash in release_ip if a connection to a non-public
    address disconnects first (Samba#15523).
  + shadow_copy2 broken when current fileset's directories are removed (Samba#15544).
  + 'force user = localunixuser' doesn't work if 'allow trusted domains = no'
    is set (Samba#15469).
  + smbget: debug logging doesn't work (Samba#15525), username in the smburl and
    interactive password entry doesn't work (Samba#15532), auth function doesn't
    set values for password prompt correctly (Samba#15538).
  + Unable to copy and write files from clients to Ceph cluster via SMB Linux
    gateway with Ceph VFS module (Samba#15440).
  + Multichannel refresh network information (Samba#15547).

- Replace samba service pam config to samba-common due regression with password
  authentication in security = user mode with obey pam restrictions = yes.

- Update to stable release of Samba 4.19 with fixes of the Samba CVE for
  Deleted Object tombstones visible in AD LDAP to normal users (CVE-2018-14628).
- Security fixes:
  + CVE-2018-14628: Wrong ntSecurityDescriptor values for "CN=Deleted Objects"
                    allow read of object tombstones over LDAP
                    (Administrator action required!)
                    https://www.samba.org/samba/security/CVE-2018-14628.html