CloudBees Replication Parent 1706

Previously, the X-Jenkins-Replica-Host & X-Jenkins-Replica-Address headers were added to all HTTP responses in an HA controller. Since these are diagnostic tools, and internal host names or IP addresses could be considered sensitive in some environments, these are now included only when developer mode is enabled, and only for requests authenticated as a user with Overall/SystemRead permission, just like the corresponding notations in the GUI.