Allow environment variable substitution in config yaml about tavern HOT 5 CLOSED

In #6 we're looking at adding a means to pass in variables on the command line. I expect that will be the preferred way to pass env variables to tests in tavern.

leaving this open for now, until we move forward with #6 and decide if this is needed as well as that.

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I realised this was only a couple of lines of code to do so I have implemented it in this branch https://github.com/taverntesting/tavern/tree/feature/env-var-formatting - not sure what the 'magic' variable name should be for environment variables though? I suppose that it just means people can't save a variable called ENV_VARS

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👍 we'll test it out and let you know of any issues.

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I have tested this branch out and it works very well for me as I am using tox with tox-docker which launches my docker container and leaves an environment variable in the form of for any port listed with EXPOSE in the Dockerfile.

So now when tox-docker starts the container, pytest runs with the Tavern plugin I can use the ENV_VARS in the yaml file to get the correct port for the url to test my microservice. Good work 👍

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With #36 there is going to be a value called tavern.env_vars that you can format environment keys from

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