Revert "Pytest works fine with extra log handlers"
Revert "Pytest works fine with extra log handlers"

This reverts commit 14cdda14d383f5ec346cd50ee22a75585031acf0.

Otherwise, we add a new StreamHandler each time we call main() and would end
up logging everything multiple times. (This is visible in PyCharm, which
does not swallow the messages.)

marcelm/cutadapt