Fix: Source zookeeper from cloudera and peg version

- We were installing zookeeper from the ICS apt source, but
  it requires jre6 and for some reason that's no longer on the v3 AMI.
- Source zookeeper from cloudera because we're doing away with the ICS
  apt source anyways.

Squashed commit of the following:

commit 1583058ad9d3d0cffaad4eff86ab0f4cb6653919
Author: David Snyder <david@infochimps.com>
Date:   Thu Apr 17 15:20:03 2014 -0500

    Source zookeeper from cloudera and peg version

    Change-Id: I5718cca5082bee86c81f76fcc261136e27dbd12b

Change-Id: Ie21b3c392a40c9f7d68f7c7106e1c41d19789f55