Change url link to Zookeeper package
Change url link to Zookeeper package

I change url link for new Zookeper version. The oldest version doesn't
accessible in original apache SDN.

Closes-bug: 1587073
Change-Id: I1e364ab0dc2db3b5ad7c9d4ae8aaea5fd189b17a

openstack/sahara-image-elements,openstack/sahara-image-elements