Minor: Cleanup etc/webinput.conf in setup.py and INSTALL.md

[bernhardreiter]

intelmq-webinput-csv/setup.py

Line 34 in 1ce5f8d

'etc/webinput.conf',

does not exist in the repository. And
is already in there:

intelmq-webinput-csv/setup.py

Line 11 in 1ce5f8d

['intelmq_webinput_csv/etc/webinput_csv.conf',

One way to distribute webinput_csv.conf should be enough and data_files seems to be the better one, if this is placed outside of the modules destination.

However, right now it is has a fixed path, and does not honor the variable position of modern IntelMQ versions. The documentation INSTALL.md believes that the example place does not work, probably because of permission problems. However INSTALL.md says that the file should be places from the module destination to the example destination, it probably should be the real configuration place where it is read from.