Tiller cannot be upgraded by users

[seanknox]

Is this an ISSUE or FEATURE REQUEST? (choose one): ISSUE

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What version of acs-engine?: v0.5.0

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Tiller resources are defined with kubernetes.io/cluster-service: "true" label which the addon-manager interprets as an uneditable resource. Users who try to bump the Tiller version will have their bump reverted by addon-manager.

kubernetes.io/cluster-service: "true" is deprecated and should be removed from resources for the more explicit addonmanager.kubernetes.io/mode: "EnsureExists" or addonmanager.kubernetes.io/mode: "Reconcile" notation.

This is an issue just against our Tiller install, but kubernetes.io/cluster-service: "true" should eventually be replaced across all other resources using it.