
Saving json responses all on one line escaped inside of json cassettes is great for computers, but is impossible for humans to read. Add a serializer that is nicely flowed yaml that emits multi-line values as yaml blocks. Additionally, re-flow and indent the nested json, which will stay as json. An example of the output produced can be seen at: https://review.openstack.org/#/c/328338/2/shade/tests/unit/fixtures/test_create_flavor.yaml Hook it in to the keystoneauth1 betamax fixture by default, because why in the world would you want ugly when you can have pretty. Change-Id: I457408fcbbdca240090228d18f0482f958a7d6e4