Add zookeeper-servers to nodepool.yaml
Add zookeeper-servers to nodepool.yaml

This is needed as part of our zuulv3 effort. Specifically, nb01.o.o
will use them.  This will be a noop for zuulv2.

Change-Id: Iabd54fedc8c12bcd3a0fd76b9fc48a93c941bad5
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

Tesora/tesora-project-config,openstack-infra/project-config,openstack-infra/project-config,Tesora/tesora-project-config