Set use_syslog for all HA examples

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Add limitsize for daily logrotate, add comments for examples

Log's size limit should be > minsize allowed for rotation (30M hardcoded).
Daily rotation should also include minsize to avoid small files being rotated

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Merge pull request #333 from bogdando/fixes_hasyslog

Minor fixes for syslog in HA examples and minsize for logrotate