Create temp directories in "test" dir
Create temp directories in "test" dir

Don't create the temp dirs in the current directory, but create them in
the same directory as the credentials.conf file is. We still need to
prevent deleting them on test failure, so that they can be inspected
manually.

Signed-off-by: Sebastian Spaeth <98dcb2717ddae152d5b359c6ea97e4fe34a29d4c@SSpaeth.de>

frioux/offlineimap,frioux/offlineimap