snort: merge Altell packaging fixes

snort: merge Altell packaging fixes

Snort was independently packaged by Altell some time ago, so merge things
we've done into OE.dev:
 * fix packaging of snort dynamic libs
 * fix DEPENDS, libnet is not needed is not specifically used
 * fix RDEPENDS, no need to specify libs expicitly, barnyard is rather a
   RRECOMMENDS than RDEPENDS since snort lives just fine without it
 * add libprelude support and configure accordingly
 * add some useful configure options
 * add init/volatile/default setup which is necessary for the package
 * add postinst creating snort/snort user/group
 * add logrotate script

Signed-off-by: Roman I Khimov <khimov@altell.ru>