Revert "A sysctl to silence the bell when newcons is in use."

This reverts commit c2a03c9634e7ea09689e1d36aa898ff86b1d356d.
Merge branch '20131224-newcons-bell-sysctl' into markj-develop
Use ray's patch, which adds kdbcontrol support for disabling the bell.
Merge branch '20131224-newcons-bell-sysctl' into markj-develop