Add cluster scale-up blocking "wait" function #90
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flake8 rhg_compute_tools tests docs
Adds a rhg_compute_tools.kubernetes.wait function which blocks until a cluster reaches the requested number of workers.
Note I couldn't quickly figure out how to implement this on gateway. They have totally changed the object interface to clusters and schedulers - everything is now async and I can't even figure out how to get the current number of workers, let alone the requested number.