Add rdns as a submodule.
Integrate rspamd with librdns.
Fix PTR requests handling.
Support accepting listening sockets from systemd.
Set cloexec flag to sockets obtained from systemd.
Set flag for systemd sockets definitions.
Do not send multiple SURBL requests with the same domain.
Varargs versions of logging functions.
Adopt DNS logging.
Do not remove rspamd user in prerm (See #621833)
Fix name of pkg-config snippet for hiredis
Turn off bundled hiredis
Move preinst to postinst, rspamd does not need anything in preinst
Ship /var/{lib,log}/rspamd in package

Conflicts:

	debian/postinst
/var/run is transient, create subdirectory in initscript instead
/var/lib/rspamd ownership is fixed, don't allow to override
Use /run/rspamd to store pid file, /var/run is obsolete
No need to specify group for chown explicitly
Use _rspamd as a system user in Debian
Use dh instead of CDBS