Pull in the zookeeperd package instead of the zookeeper package

Instead of installing the zookeeper package (which is just the basic
files) we should just install the zookeeperd package (which includes
the upstart scripts to run the zookeeper server) so that those who
want to test against zookeeper do not have to start/stop the server.

Change-Id: I83ee1c30fb8adb345f36c5facf3f06dcf059ef0f
Merge "Pull in the zookeeperd package instead of the zookeeper package"