The store host's `swarm-bao-pki` now also signs, for every hive in
`swarm.hives` other than its own, the reader (`<hive>`), queue-agent
(`<queueAgentCommonNamePrefix>-<hive>`) and gateway-leaf
(`<hiveLeafCommonNamePrefix>-<hive>`) leaves, into
/var/lib/swarm-bao-pki/hives/<hive>/ with the basenames the own hive's
leaves use. Same CA, same `signLeaf`, idempotent on absence like every
other leaf in the unit. `signLeaf` now takes the CA from the top of the
PKI directory rather than from the leaf's directory; every existing
caller passed that directory, so their output is unchanged.
The operator still copies the files to the other hive's host and names
them in config; only the openssl step against the CA goes away
(mara on #5016, c95685: "ok mint").
Closes#5016
48a728df17