Rudder

Currently our installation outputs contains a lot of useless stuff, that may mask actual problems.

The rationale behind this change is that our current install/update output is always big and contains various messages at various log levels, which makes it really hard to know at first sight if something went wrong.

Most of these messages only indicate a normal behavior "Creating users... Done", and they are unexpected in rpm/deb scripts, which are usually silent except when something goes wrong.

Messages in package script output should either:

• Indicate an error
• Give important instruction to the user

We should keep the volume minimal to make these messages stand out.