Add support for service instance sharing

[jenspinney]

A new feature allowing service instances to be shared across orgs and spaces was released in cf-deployment version 1.10.0. This doc explains the very simple step required to enable this feature for your service (adding a shareable field to your service-level metadata in the catalog). Have you thought about enabling this for your sample broker app (https://github.com/cf-platform-eng/tile-generator/blob/master/sample/src/app/app.py)?

[cf-gitbot]

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