db: applied pcmoore's gist for GH issue #112

Note that as cited in the gist, this commit is not ready to be
committed yet.  Specifically:

* investigate _db_tree_prune(), that likely needs some logic (lt/gt)
  flipping to compensate for the changes in _db_tree_add()
* run the full regression test to ensure we aren't accidentally breaking
  anything
* separate patch to add this test case to the regression tests
* separate patch to clear up the macros in src/db.h, see db_chain_lt() as
  an example

Full gist is here:
https://gist.github.com/pcmoore/f644341a85c6ad7131a26f68f99e3fc6

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
[PM: subject line tweak, testing has proven this commit is OK and necessary
     to restore proper db ordering, also fix the 'make check-syntax' errors]
Signed-off-by: Paul Moore <paul@paul-moore.com>

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