test hanging and actually is an indication that there's a condition that is
not being properly handled at some point in the library.
Loop counter limits might need to be further increased on false positives.
would crash if a bad function sequence was used when shutting down after
using the multi interface (i.e using easy_cleanup after multi_cleanup) so
precautions have been added to make sure it doesn't any more - test case 529
was added to verify.
