Replace the rest of the non-object-using test_compute tests

This has some effects on both conductor task and shelve tests. The
shelve tests are overly complex and a troubling mix of objects and
raw DB, which I converted as best I could.

Related to blueprint flavor-from-sysmeta-to-blob

Change-Id: I410af5ce989555b6f7cb80676f0ed0537855b9ce
Merge "Replace the rest of the non-object-using test_compute tests"