Tests should not try to do 6.5-specific tests against a 6.0 server

We have a number of tests that fail because they are trying to upsert a named collection into a bucket, for instance, against a 6.0 server.  We should be slightly more clever here, and either make the tests notice that and use the defaultCollection (when possible) and/or skip tests that rely on 6.5 features.  

For groups, I did this already by noticing that we got a 404 back when trying to create a group.  In that case we skipped a few tests.  Perhaps now with recent error handling changes, we will get back a NOT_SUPPORTED error and we can use that?  And similarly for scopes, collections, etc...