Revert "Small changes to threading to send thread names to unmanaged threads. Needs Mono 3.6+ to see thread names in utilities like top -H . Some formatting of the thread name to fin in the 16 byte limit on Linux. Please test on Windows to see if the work has any adverse effects."

This reverts commit af286d5fcb688e8b64202b6deca4f249e9a2b6b8.
Issue with Jenkins builds