Allow a user to toggle zuulv3 settings for nodepool. Change-Id: Ifdcfadca1a56a48b958cd612fba67bdc9d8d3653 Depends-On: I7fff2565f9e77d737c247f204925f66a0e4aabe8 Signed-off-by: Paul Belanger <pabelanger@redhat.com>