Fix/ooniresources

fixes https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766061
The problem with setting this to /var/log/ is that if for some reason ooniprobe is run first as root then the log file will have the permissions of root and the user will not be able to run it.

I would suggest we go about this by either creating the log file at install time or having logic for creating it with the correct permissions.