Severe errors should be printed to stdout regardless of whether `--verbose` is specified or not

[Karl-Philipp Richter]

Deactivating the `asterisk` service in `rcconf` causes the error

    /usr/sbin/update-rc.d asterisk disable
    insserv: warning: current start runlevel(s) (empty) of script `asterisk' overrides LSB defaults (2 3 4 5).
    insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `asterisk' overrides LSB defaults (0 1 6).
    insserv: script zfs-mount: service zfs already provided!
    insserv: warning: script 'refdb' missing LSB tags and overrides
    insserv: There is a loop between service wulf2html and refdb if stopped
    insserv: loop involving service refdb at depth 2
    insserv: loop involving service wulf2html at depth 1
    insserv: Stopping refdb depends on wulf2html and therefore on system facility `$all' which can not be true!
    insserv: exiting now without changing boot order!
    update-rc.d: error: insserv rejected the script header

logged after the listing of all service when `rcconf` is invoked with `--verbose`. When `--verbose` is omitted this severe error simply isn't displayed and the user has no idea what is going on. Severe errors should always be logged. If necessary add a `--quiet` option and the according behavior when it is desired to really provide no feedback at all. This issues is not about the issue pointed out be the error message.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: rcconf 3.1ubuntu1
Uname: Linux 3.17.7-031707-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Dec 19 14:09:06 2014
PackageArchitecture: all
SourcePackage: rcconf
UpgradeStatus: No upgrade log present (probably fresh install)