Add non-intrusive ctrl-c handling

Instead of trying to use a signal handler to stop
when ctrl-c is triggered use technique that cooperates
better with the threads that are running and lets
them die a happy death vs being forced to die in
unpleasant ways.

Closes-Bug: #1586476

Change-Id: I7fdb6a77a144bdd02276cca07b616bbb0c2f1957