Updates nova notty file
Updates nova notty file

No need for appending to the notty file, standard redirect of
output is more appropriate.

Change-Id: I6d70698ae29ec90b8d916ae0b8a7ccca10237f2c

openstack/tripleo-image-elements,rdo-management/tripleo-image-elements,radez/tripleo-image-elements,radez/tripleo-image-elements,rdo-management/tripleo-image-elements,openstack/tripleo-image-elements