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

cinder/scheduler/filters/retry_filter.py

@@ -1,46 +0,0 @@
-# Copyright (c) 2012 OpenStack Foundation
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from cinder.openstack.common import log as logging
-from cinder.openstack.common.scheduler import filters
-
-LOG = logging.getLogger(__name__)
-
-
-class RetryFilter(filters.BaseHostFilter):
-    """Filter out nodes that have already been attempted for scheduling
-    purposes
-    """
-
-    def host_passes(self, host_state, filter_properties):
-        """Skip nodes that have already been attempted."""
-        retry = filter_properties.get('retry', None)
-        if not retry:
-            # Re-scheduling is disabled
-            LOG.debug("Re-scheduling is disabled")
-            return True
-
-        hosts = retry.get('hosts', [])
-        host = host_state.host
-
-        passes = host not in hosts
-        pass_msg = "passes" if passes else "fails"
-
-        LOG.debug(_("Host %(host)s %(pass_msg)s.  Previously tried hosts: "
-                    "%(hosts)s") %
-                  {'host': host, 'pass_msg': pass_msg, 'hosts': hosts})
-
-        # Host passes if it's not in the list of previously attempted hosts:
-        return passes