Read the configuration once for all func tests

Merge the swift_testing module into the functional test module itself,
so that we can read the configuration once for all unit tests, sharing
the same constraints.

Change-Id: I9fbbfdade9adca329cd79f7d4291ba009327c842
Fixed error in container sync exc handling

If container sync got a non-ClientException and then a ClientException
during a get/put operation, it previously would break in the error
handling.

Change-Id: Ib2fa70270f3ec870bf60d5bbb3e8f514aeeb0927
Merge "Read the configuration once for all func tests"