Closes #294 - Fluo now uses a chroot suffix in its Zookeeper connection ...

Removed old ZK root prop & added Accumulo ZK connect prop.

Pull request for #294 
Fixed in f6df8296b.  I updated fluo.properties to clarify the use of chroot.  Initialization of a fluo instance will also fail a if a chroot is not specified.  I think a chroot should be required as we delete the chroot during re-initialization so it should never be '/'.