syslog-ng.conf: Log warnings to /var/local/natinst/log/kern.log
syslog-ng.conf: Log warnings to /var/local/natinst/log/kern.log

Lower filter threshold from level(err..emerg) to level(warning..emerg).

Signed-off-by: Haris Okanovic <4f2c24956fa4a8756878315db434b9fed29fa615@ni.com>
Acked-by: Alex Stewart <04cdb2793e4fb0120cc30d1c823099f3862701f4@ni.com>
Acked-by: Gratian Crisan <17cf39b7426cfdea7dd491f7105a23841aaa302f@ni.com>
Natinst-ReviewBoard-ID: 322068

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt