[issue3769] Deprecate bsddb for removal in 3.0

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Since SQLite has a blob type and allows text keys, we should be able to
make a substitute that doesn't depend on bsddb.

Against, recommend holding-off on removal until 3.1 so we can bake in a
reasonable substitute (esp. for shelves where dumbdbm is a really bad
fallback).

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