functions.pl: pakfir cleanup

functions.pl: pakfir cleanup

- I wondered what was supposed to be in the pakfire.log file that has always been empty
   so I had a look around and discovered that it has been commented out since CU30
- So this patch removes that commented out line and the other patches in this set
   remove the creation of the empty pakfire.log file and stop it being restored etc

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>