Tweak the 'load balancing' algorithm
In order to reduce contention we randomly skipped jobs, but this
caused many jobs to end up stopping early. Now instead we keep on
going until we time out (also increased the chance of doing work).
Patch by: Sverre Rabbelier
"""
>>> from django.contrib.sites.models import Site
>>> from django.conf import settings
>>> Site(id=settings.SITE_ID, domain="example.com", name="example.com").save()
>>> # Make sure that get_current() does not return a deleted Site object.
>>> s = Site.objects.get_current()
>>> isinstance(s, Site)
True
>>> s.delete()
>>> Site.objects.get_current()
Traceback (most recent call last):
...
DoesNotExist: Site matching query does not exist.
"""