setting allow_versioned_writes to false in proxy config file causes functional tests to fail

For each error, I get the following line:

ResponseError: 412: 'Precondition Failed' (None None) txid=txacbf413d5c3d4fb2903ad-00564f7860

It looks like the tests are expected to fail with a 412 error when allow_versioned_writes = false, based on the following file (at the time of writing, on lines 105-106):

https://review.openstack.org/#/c/134347/44/test/unit/common/middleware/test_versioned_writes.py

Since the tests behave as expected, my course of action is to have functests skip running the tests associated with TestObjectVersioning and TestObjectVersioningUTF8.

After introducing code that skipped the TestObjectVersioning and TestObjectVersioningUTF8 tests, I encountered an issue when running .functests. Tests associated with TestObjectVersioningUTF8 kept getting errors. After some debugging, I discovered that the TestObjectVersioningUTF8 tests were not going through setup. The solution was to set the variable set_up = True in the TestObjectVersioningUTF8 class in tests.py.

Currently, the number of failed tests when setting allow_versioned_writes to false has decreased significantly. It is only test.functional.tests.TestSloWithVersioning.test_slo_manifest_version that fails at this point.