Initial clean up of blitz integration tests (Fix #10560) (rebased onto dev_4_4)



This is the same as gh-1000 but rebased onto dev_4_4.

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With these changes omero.db.poolsize and a few other startup
issues are now taken care of, but the `integration` suite in
general is still quite a ways from being green.

The next step is likely to start removing and/or disabling
out-dated tests.