Comment 4 for bug 1025536

Checked the same in mysql-log-rotate.sh for PXC 5.5 and PXC 5.6

@localstatedir@/mysqld.log {
        # create 600 mysql mysql
        notifempty
 daily
        rotate 3
        missingok
        compress
    postrotate
 # just if mysqld is really running
 if test -x @bindir@/mysqladmin && \
    @bindir@/mysqladmin ping &>/dev/null
 then
    @bindir@/mysqladmin flush-logs
 fi
    endscript
}