Should ignore `insserv`-Warnings about overriding LSB defaults

[xtaran]

aptitude-robot's log parsing should ignore insserv-Warnings about overriding LSB defaults, e.g. these from the apache2 package:

Restarting Apache httpd web server: apache2.
insserv: yellow warning: current start runlevel(s) (empty) of script `apache-htcacheclean' overrides LSB defaults (2 3 4 5).
insserv: yellow warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `apache-htcacheclean' overrides LSB defaults (0 1 6).

These are not warnings for the system administrator but for the package maintainer (if at all).