Jaraco-mongodb

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Removed workarounds module.

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Added workarounds module with ``safe_upsert_27707``.

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No longer startup MongoDBInstance with

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``assert_covered`` now will fail when the candidate cursor
returns no results, as that's almost certainly not an effective
assertion.

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Nicer rendering of operations in the oplog tool.

In ``testing`` module, assertions now return the objects
on which they've asserted (for troubleshooting or additional
assertions).

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6: Oplog tool will now include, exclude, and apply namespace
renames on 'renameCollection' commands.