* 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
* Start work on passing context to backends
* More work on passing context
* Unindent logical system
* Unindent token store
* Unindent passthrough
* Unindent cubbyhole
* Fix tests
* use requestContext in rollback and expiration managers
1) Use the new LeaseExtend
2) Use default values controlled by mount tuning/system defaults instead
of a random hard coded value
3) Remove grace periods
