Revert "DEPL-6974: Removed SlaveRemoteDescriptorRegistry - plugin now uses DeployitServer.getDescriptorRegistry() to initialize remote booter."
DEPL-6974: SlaveRemoteDescriptorRegistry#boot is now synchronized and we remove old registries if they are found.
Released Jenkins XL Deploy plugin 4.5.0
Set development version to 5.0.0-SNAPSHOT