tests: increase timeout for starting ftp server

There is "Time out after 5 s." in log for commit 2f83f3a. However timeout
is only 50 * 0.01 = 0.5 sec. So increse step from 0.01 to 0.1 sec to be
really 5 sec. I need this because 0.5 sec isn't enought on my laptop.
Update .gitignore for test-driver

This file is generated from autotools since commit 622024a.
tests: do not create stuff.txt

Looks like stuff.txt is writen, but not used and also not deleted,
therefor don't create this file anymore.