Scoped Transactional queries broken

The TransactionQueryOptions missed a change in the Scope class, so now scoped transactional queries are broken.  The error -

couchbase.exceptions.TransactionFailed: TransactionFailed{<message=AttributeError("'Scope' object has no attribute 'bucket'")>} 

is simple to fix.   However, lets instead come up with a way to test the transaction options/config classes better.   We cannot just make use of all options and test the effects.   Better we just insure the right thing is in the underlying c++ object.   One way - have a function that returns a dict of the pycbc_core option.   Then we know we are setting things correctly in the option classes.