changing the model so that if you try to change the type, it will fail validation.
Audit Log interface, schema, and cassandra implementation

More audit log stuff.

More audit logging work

Audit log tests and docs
Merge branch 'master' into auto-425-no-change-policy-on-update
scheduler system test scenarios
test for mutiple policies to execute at the same instance
skipping cron tests
refactor the header validation, setup and using constants
changes fetch url from config for dev and preprod
changes to links test
clean up scripts
changes to server metadata
negative test time.now
updated cloudcafe version
Don't use pretty JSON in prod.  Logging single line will make getting it into logstash easier.
Fix lint.
Actually handle indent=False.
Simpler indent=False
in Additional Resources, add suggestion to see GitHub repo
manisht reviews + negative test for update policy type
adding more cooldown validations

clean up within scripts