istio/old_mixer_repo

Design versioning of interface between mixer and adapter.

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We want an ability for Mixer to change its interface (code generated), in the future, between itself and adapter developers. This will allow us to introduce new features that might need breaking existing interface between Mixer and adapter, and at the same time not break adapters that are using old interface.

We also need a deprecation story for old version of Mixer-adapter interface, so that Mixer does not have to keep supporting all possible version.