Reservations RP 2018-06-01: Add new reserved resource type CosmosDb

[luluRagdoll]

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The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#3185

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[annatisch]

Thanks for the updates @dorislewisbjtu!
Almost good to go - last change, could you please update the "package-version" in the Python config?
https://github.com/Azure/azure-rest-api-specs/blob/01b5a8a327c4632b3c0a8b8732cff484df56d37d/specification/reservations/resource-manager/readme.md#python

The currently published Python SDK is v0.2.1 - so I guess this could be updated to 0.2.2.

Thanks!