(PDB-904) Switch fact_values.value_string trgm index to be GIN not GIST

There were reports of crashing due to a bug in pg_trgm indexing when a large
fact value was loaded into PuppetDB.

This patch removes the old index via migration, and will then replace it with
the index handling mechanism.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #1106 from kbarber/ticket/stable/pdb-904-switch-large-trgm-index-to-use-gin

(PDB-904) Switch fact_values.value_string trgm index to be GIN not GIST
(PDB-13) Add wheezy to PDB acceptance tests

This PR adds a wheezy image to our acceptance tests.
Merge pull request #1098 from wkalt/ticket/master/pdb-13-add-wheezy-acceptance-test

(PDB-13) Add wheezy to PDB acceptance tests
(PDB-653) metrics update on PDB start

Previously the DLO metrics only updated on a failed command submission, which
meant restarting PDB would blank the metrics until the next failure. This patch
initializes DLO metrics on PDB startup if the DLO directory, which is created
on first failure, already exists.
Update release notes for PDB 2.2.1 release.
Merge pull request #1119 from wkalt/2.2.1-release-notes

Update release notes for PDB 2.2.1 release.
add db fallback test
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extend roles
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