A self-signed gateway on a host with deploy.hive-controller.enable off
(a dedicated swarm-services host) needed the hive leaf for its catch-all,
and that leaf now comes only from hive-tls-resign with a per-hive store
identity. hive-tls-resign and its timer are now defined only where a hive
runs; elsewhere hive-gateway-self-signed-cert installs the swarm-services
leaf as the default cert, and the gateway waits for swarm-services-cert.
Also corrects the hive-gateway comments and option text that still said
the leaf is hive-CA-signed.
Refs #4588
75a7dccee6