log_maint.pl: Delete sessions with old LOGEND date
log_maint.pl: Delete sessions with old LOGEND date

#953

- Delete sessions where LOGEND is older than 60 days
- Skip logs without LOGEND
- Skip LoxBerry Update installations
- Skip Plugin Installations

mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry