syslog-ng: uprev to 3.5.4.1

- initscript: add status, PIDFILE and xconsole
- syslog-ng.conf: dump the version
- Fix some memory leak problems we found
- Some backport patches
- scl: fix wrong ownership issue
- libnet: add libnet enable option and add it in PACKAGECONFIG
- add HOMEPAGE
- remove INC_PR
- change some config into PACKAGECONFIG
- add PACKAGE syslog-ng-libs to fix QA issue
- use volatiles
- inherit update-rc.d and update-alternative

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>