Port replication configs are not being set into the ring files.
When replication port configs
(account|container|object)-server-port-rep, are changed in the
swift-storage charm, swift-storage changes the related configs in
the config files, but that does not update the rings.
This patch adds a function that runs in every config-change
triggered from the swift-storage nodes and make sure any replication
config is written to the ring and distributed to all nodes.
Partial-bug: #1903762
Change-Id: I87eb23de94e3f2f5b06d44df1f8bd9d2324456a0
498d3b0f1e