Chris Dent d38844e390 Implement allocation candidate mappings
In microversion 1.34 add a 'mappings' key to each allocation
request. Its value is dict keyed by resource group suffixes
with values of a list of resource providers satisfying that
group.

To preserve symmetry, the mappings key may be sent back when
writing allocations so the schema for POST and PUT allocations
and POST /reshaper are updated.

api history, api-ref and reno are added

Change-Id: Ie78ed7e050416d4ccb62697ba608131038bb4303
Story: 2005575
Task: 33536
2019-06-12 21:19:14 +00:00
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