Test that default mts value of 0 works properly.

The default value for the mts parameter is 0. The
determineDynamicCount() method has to return a degree of 1 in that case
to ensure that all operations are properly expanded (e.g. RadixJoin)
with a degree of parallelization of one.
Merge pull request #331 from kaihowl/pullrequest/mts-0-tests

Test that default mts value of 0 works properly.