Pull latest scheduler change from Oslo

Pull latest scheduler change from Oslo

The RetryFilter is now part of Oslo, although it's been renamed to
IgnoreAttemptedFilter.  Thanks to entry_point, we are able to maintain
backwards compatibility after pulling that commit from Oslo.

Commits in this change:
* 66fe978 2013-12-10 | Change IgnoreAttemptedHostFilter to expect 'retry' key (attempt-retry)
* 135dd00 2013-12-10 | Remove start index 0 in range()
* 45658e2 2013-12-09 | Fix violations of H302:import only modules
* 70004c6 2013-12-04 | Add IgnoreAttemptedHostsFilter to oslo
* 880acf7 2013-11-14 | Change capabilities filters to use resource type (capfilter_message)
* 06e9d98 2013-11-10 | Add some log messages to capabilities_filter.py
* 3970d46 2013-11-02 | Fix typos in oslo
* 8718763 2013-08-19 | Replace list with dict in AvailabilityZoneFilter.host_passes
* c0d052a 2013-07-12 | python3: Add basic compatibility support.
* e3545f8 2013-06-02 | Enable hacking H402 test
* 484a1df 2013-05-30 | Enable hacking H403 test
* 35660da 2013-05-30 | Enable hacking H401 test
* 5dcc43b 2013-05-05 | Break out common functionality for filters and weights
* 1f2aba5 2013-05-03 | Renames filter to base_filter and weight to base_weight

Change-Id: Ibeb685ef60e44cb6388fc460ee6a78255ed3dbae