Fetching Upstream Templates Slow

[mjallday]

Overview of issue:

INFO: Obtaining upstream templates for python/v1 ...

This step clones a very large (almost 1gb) repo

https://github.com/DataDog/apigentools/blob/3bda8e2952b60a86d84ca79e3077cc9c1acf37a3/apigentools/commands/templates.py#L124

Caching this or fetching from a local source would improve this dramatically. Describe the results you received:

Slow fetching of this repo every time I run the command

Describe the results you expected:

Quick fetching of the repo after the first time

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