afinet: max packet length for spoof source is set to 1024

If actual packet size is bigger than AFInetDestDriver.spoof_source_maxmsglen,
the packet is truncated.

AFInetDestDriver.spoof_source_maxmsglen is set to 1024
and cannot set via config file at this time.

Signed-off-by: Budai Laszlo <Laszlo.Budai@balabit.com>
Merge pull request #341 from lbudai/f/truncate-spoof-source

afinet: max packet length for spoof source is set to 1024
afprog: kill program destination before stopping syslog-ng

Stop procedure of syslog-ng is not stopped program destination and it is
running after syslog-ng was stopped. This patch set program group ID to all
child processes of syslog-ng and kill them process that have the same
program gorup ID than syslog-ng before syslog-ng has been stoped.

Signed-off-by: Budai Laszlo <Laszlo.Budai@balabit.com>
Merge pull request #342 from lbudai/f/fix-prog-dest-respawn

afprog: kill program destination before stopping syslog-ng
filter: add new ipv6 netmask filter by "netmask6" tag

usage:
	"ipv6address/prefix"
where
	ipv6address = valid ipv6 address
	prefix = integer number from 1 to 128

Signed-off-by: Fried Zoltan <zoltan.fried@balabit.com>