SDK 4: repeated calls to cluster.close() results in segmentation fault

Calling cluster.close() multiple times results in a segmentation fault.

If you run the test program without parameters, it will run a loop 4 times to simulate a larger program that may make multiple calls to Cluster to instantiate cluster objects along with REST API calls. If the loop runs more than once, the second call to cluster.close() results in a segmentation fault.

Works (does not do a close in the loop):

u_test.py

Seg faults:

u_test.py --close