* Adding support for Consul 1.4 ACL system
* Working tests
* Fixed logic gate
* Fixed logical gate that evaluate empty policy or empty list of policy names
* Ensure tests are run against appropiate Consul versions
* Running tests against official container with a 1.4.0-rc1 tag
* policies can never be nil (as even if it is empty will be an empty array)
* addressing feedback, refactoring tests
* removing cast
* converting old lease field to ttl, adding max ttl
* cleanup
* adding missing test
* testing wrong version
* adding support for local tokens
* addressing feedback
What we should probably do is create a client with a mutex and
invalidate it when parameters change rather than creating a client over
and over...that can be a TODO for later but for now this fix suffices.
Fixes#1428
