pkg: cluster, fixed typos and returns

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
controller, host, pkg: ListHosts returns an Array of host.Host

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
bootstrap, controller, pkg, test: Standardize event channels

Signed-off-by: Corey Powell <mistdragon100@gmail.com>