add systemd integration
Add --with-systemd / --without-systemd options to check whether
libsystemd-daemon library is available and use it to report service
startup status to systemd for smbd/winbindd/nmbd and AD DC.
The problem it solves is correct reporting of the Samba services
at the point when they are ready to serve clients, important for
high availability software integration.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=10517
Signed-off-by: Alexander Bokovoy <ab@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
(cherry picked from commit
54b5d9a7384ae27b2a26586ff909128427c05abe)