Ian Wienand e7f1062d51 Add install zookeeper role; use for nodepool-builder testing
This adds a simple role to install Zookeeper.

Add an option to nodepool-base to use this role to install Zookeeper.

Use this in the nodepool-builder gate testing where we are just
validating that the nodepool-builder container starts and is ready to
accept connections.  It needs a zookeeper to talk to, even though it
is not going to do anything.

Change-Id: I4ae89a51e454be4ee53ad4e04407162aaa8d9f9a
2020-03-06 14:02:52 +11:00
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