**Docs request:** Cannot run acceptance tests

[johannaratliff]

Is this an Issue/Bug or a Feature Request?

[ ] Issue or Bug
[x] Feature Request

What is this issue about? Or why do you want this feature?

As an open source contributor with no knowledge of the team's internal workings, I would like to be able to run acceptance tests before filing a PR. Currently, scripts/test excludes acceptance.

Currently our TestConfig assumes a deployed environment to override the env vars, but we don't communicate that.

I would appreciate more documentation in the README about how to run the tests so I can be assured I wired everything up correctly.

2019/05/09 15:02:54 failed to load metric store acceptance test config: 
missing required environment variables: CA_PATH, CERT_PATH, CLIENT_ID, CLIENT_SECRET, KEY_PATH, METRIC_STORE_ADDR, METRIC_STORE_CF_AUTH_PROXY_URL, UAA_URL

Please provide output that helps describe the issue:

[cf-gitbot]

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