Bump to 3.5.0-alpha.  Make way for externally supplied config.
Flocker configuration for a single node, three-server ZooKeeper ensemble (ridiculous, I know).
Thirty nodes is a lot.
The internal ports will be the same on all containers.  Only vary the external ports to avoid collisions.  Also adjust the config to use the IP we expect and those external port numbers.

The client port will be different for each server so we will definitely need multiple config files,
but we knew that already.
Fixes necessary to actually build the image.
Try to simplify?  Do not vary internal and external ports at all.
The configuration files for each of the three nodes.
See other config files.