Merge remote branch 'stable-2.4' into devel-2.4

* origin/stable-2.4:
  Fix typo in kvm-ifup script
  NEWS: Replace smartquotes, start lines with uppercase
  Update NEWS and release 2.4.0 rc3
  Fix potential data-loss bug in disk wipe routines

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>