wats: wait for cluster name to appear
wats: wait for cluster name to appear

The "picks up cluster name from configuration" test occasionally flakes
because the cluster info had not yet been fetched. This commit adds a
polling loop of up to 10 seconds to wait for the cluster name to be
populated.

Signed-off-by: Aidan Oldershaw <30ef7a6e0d016bc846f26d89dacbd23aceded206@pivotal.io>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse