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hiera: use the proxy backend, rationalize the hierarchy

Description

hiera: use the proxy backend, rationalize the hierarchy

As any hiera hierarchy should move from more-specifc to less-specific
lookups, it is natural to have per-role configs to be searched right
before global (non role-specific) configs, so that they are easy to
override per-role without reverting to use of regexes

Change-Id: Ibae4a30f2abcf49ee6288bc12bfcc99285957a06