test_thrusterDynamicDataAccess
Regression test for issue #1254.
The thrusterData member of ThrusterDynamicEffector is a
std::vector<std::shared_ptr<THRSimConfig>>. After THRSimConfig was changed
to a shared pointer (commit f93eaa97b) the SWIG %template still targeted the
old value type, so thrusterData came back to Python as an opaque
SwigPyObject that could not be indexed or iterated. This test pins the
member to behave as an iterable list of THRSimConfig objects.