Figure out how to avoid tenacity retry wait times when we're using vcr cassettes

[sckott]

The problem is thus: A huge advantage of using vcr is that tests run quickly -> you can then iterate quickly b/c you don't have to lose train of thought while you make change, run tests, make change, repeat.

However, right now we use tenacity to do HTTP retries for some methods in the CromwellApi class when we do REAL HTTP requests because if we do a request too early we may get a 404, but if we do a back off and wait a bit and try again we may get a 200 response, great.

Options:

• Somehow do not record http retries in vcr cassettes. I couldn't quickly find a solution for this, but there may be one. There's no utility in saving the retries. without the retries saved in cassettes, tenacity wouldn't trigger a wait cycle -> faster tests. Played with this a bit but couldn't sort it out just yet
• Mock/patch/etc the wait times (basically sys.sleep's) coming from tenacity when we're not making real HTTP requests - so tests run more quickly Disable wait for unittest jd/tenacity#106 https://stackoverflow.com/questions/47906671/python-retry-with-tenacity-disable-wait-for-unittest

related #52