standard_filters is deprecated

When using standard_fitlers, a warning is thrown:

WARNING log.deprecated Deprecated: Use 'nova.scheduler.filters.all_filters'
instead of 'nova.scheduler.filters.standard_filters'

This is consistent with the docs for scheduler
http://docs.openstack.org/trunk/openstack-compute/admin/content/scheduler-filters.html

Change-Id: I8eee806f8b4100b2ccb6ad054e8a10722aefa5ef