storm-setup.yaml.sample - remind user it's possible to set `is_localhost_setup` to false

For a single machine setup

Signed-off-by: Pang Yan Han <yanhan@viki.com>
storm-setup.yaml.sample - Rephrase comments for `zookeeper.multiple.setup`

Signed-off-by: Pang Yan Han <yanhan@viki.com>
storm-setup.yaml.sample - rework `storm.supervisor.hosts` section

Signed-off-by: Pang Yan Han <yanhan@viki.com>