syslog-ng: Update conf to 3.5
syslog-ng: Update conf to 3.5

Updated syslog-ng conf to version 3.5 and replaced deprecated
long_hostnames option with chain_hostnames. Verified syslog-ng
3.5.4.1 now boots without warnings.

Signed-off-by: Haris Okanovic <4f2c24956fa4a8756878315db434b9fed29fa615@ni.com>
Acked-by: Ben Shelton <873d2944fc7a954ed322314738197137e10de387@ni.com>
Acked-by: Brad Mouring <58d99a887450796456131638ba4c43b5ba95afcf@ni.com>
Acked-by: Ken Sharp <e6c8ad8f54d15df4645e8aaf3f7a209bc3688570@ni.com>
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Natinst-ReviewBoard-ID: 86253

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