sanitycheck: clean up TTY on exit

The code has a lot of sys.exit() calls, but internally these
just raise a special exception. Add a try...finally block
to ensure 'stty sane' is run before leaving the script.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>

scripts/sanitycheck

@@ -4309,4 +4309,7 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    try:
+        main()
+    finally:
+        os.system("stty sane")