Current backup_restore.js test lib fires SIGINT to a currently running resmoke process and expects the process to exit with certain error codes. This process may encounter the SIGINT but proceed if the signal is caught during resmoke setup here. Resmoke will continue running the test suite which in this case repeats with `--repeat=99999`, therefore causing timeout.

Resmoke setup should be changed to consider KeyboardInterrupt and SystemExit.