Ignore filesystem mounting syslog messages
currently, these messages are beeing logged by logwatch because they contain the "error" keyword
C Dec 9 17:32:01 pixelated kernel: [ 3.729270] EXT4-fs (vda1): re-mounted. Opts: errors=remount-ro C Dec 10 09:18:17 pixelated kernel: [ 3.601728] EXT4-fs (vda1): re-mounted. Opts: errors=remount-ro
(from redmine: created on 2014-12-10)