Re: [jclouds] ServerPredicates to make waiting easier. (#355)

[Everett Toews]

>     protected String imageIdForZone(String zoneId) {
>        ImageApi imageApi = api.getImageApiForZone(zoneId);
> -      return Iterables.getLast(imageApi.list().concat()).getId();
> +      return Iterables.getFirst(imageApi.list().concat(), null).getId();

Live tests still happy.

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