[WIP] Change log file location

[DL6ER]

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Change log file location from /var/log/pihole-FTL.log to /var/log/pihole/FTL.log

Note that this is a breaking change in some sense as FTL will fail to start when the directory /var/log/pihole/ doesn't exist or isn't writable for user pihole

This template was created based on the work of udemy-dl.

[dschaper]

Hold for merge, will need to update the Core section to create the /var/log/pihole directory before we can set the FTL logs to that directory. Wait for @dschaper to approve before merge.

[dschaper]

Approved, but please hold merge

[AzureMarker]

There are still instances of pihole-FTL.log in the Makefile and readme (Travis CI config is ok though). Also, since we are making this change we should also move the other files like .pid and .port

[DL6ER]

Closing for revisiting later.

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/log-files-falsch-abgelegt-und-kein-flushing/8356/3

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/empty-pihole-folder/23855/2