
In order to facilitate the transition from precise to trusty for Juno testing we need to make zuul the decider of node labels for every job. Do this by refactoring how we apply parameter functions to zuul jobs. Since we can have only one parameter function per job it is easier to do decision logic in a single global parameter function. Add this single function and have it maintain backward compatbility with old parameter function selections. But also make it select the ZUUL_NODE for every job. Change-Id: I42fa26fc42c7dc4e94d3a7382cc8de0a5e6d1f36
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