* Don't call LeaseExtend on login renewal paths when period is provided
* WIP tests
* NoopBackend accept backend ttl values
* Test period value on credentials backend
* Use t.Fatalf instead
* Remove mockCoreExpiration
* Add login renewal test for approle backend
* Add resp.Auth.Period check on aws and cert backend tests
* Pass in approle's period via role's period
* Correctly set period in valid-role's role
* Add period renewal test using TestCluster and approle backend
* Check for ttl values after renewals on test
Jeff Mitchell