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0a46a574e6
As a first step towards using host_id to identify nodes instead of ip addresses this series introduces a node abstraction, kept in topology, indexed by both host_id and endpoint. The revised interface also allows callers to handle cases where nodes are not found in the topology more gracefully by introducing `find_node()` functions that look up nodes by host_id or inet_address and also get a `must_exist` parameter that, if false (the default parameter value) would return nullptr if the node is not found. If true, `find_node` throws an internal error, since this indicates a violation of an internal assumption that the node must exist in the topology. Callers that may handle missing nodes, should use the more permissive flavor and handle the !find_node() case gracefully. Closes #11987 * github.com:scylladb/scylladb: topology: add node state topology: remove dead code locator: add class node topology: rename update_endpoint to add_or_update_endpoint topology: define get_{rack,datacenter} inline shared_token_metadata: mutate_token_metadata: replicate to all shards locator: endpoint_dc_rack: refactor default_location locator: endpoint_dc_rack: define default operator== test: storage_proxy_test: provide valid endpoint_dc_rack