Unittests: Set logger output to ERROR

[Nebelhom]

With our first unit tests being landed, we notice that there is a lot of standard output by the scraper in between the testing. Ideally, all we want is the error output of the logger (if any), otherwise it should run through without any output by the logger at all.

Let's adjust the logger output level to ERROR when using unit tests. I would also like to see the progressbar being suppressed for the ERROR level. It should be possible to tie the progressbar to the logger level.

[davehunt]

Fixed in 8e29535