Close lock file in DailyTasksProcess
Close lock file in DailyTasksProcess

This is for instances that are created but don't get run because another
instance already holds the lock.

This isn't strictly necessary since the file should get closed when the
unused instance is GC'd, but it's better to just go ahead and do it
proactively.

PSU-OIT-ARC/django-arcutils,wylee/django-arcutils,PSU-OIT-ARC/django-arcutils,wylee/django-arcutils