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This PR allows changing the hinted_handoff_enabled option in runtime, either by modifying and reloading YAML configuration, or through HTTP API. This PR also introduces an important change in semantics of hinted_handoff_enabled: - Previously, hinted_handoff_enabled controlled whether _both writing and sending_ hints is allowed at all, or to particular DCs, - Now, hinted_handoff_enabled only controls whether _writing hints_ is enabled. Sending hints from disk is now always enabled. Fixes: #5634 Tests: - unit(dev) for each commit of the PR - unit(debug) for the last commit of the PR Closes #6916 * github.com:scylladb/scylla: api: allow changing hinted handoff configuration storage_proxy: fix wrong return type in swagger hints_manager: implement change_host_filter storage_proxy: always create hints manager config: plug in hints::host_filter object into configuration db/hints: introduce host_filter hints/resource_manager: allow registering managers after start hints: introduce db::hints::directory_initializer directories.cc: prepare for use outside main.cc