Bad server_uid generation algorithm

Multiple instances of MariaDB are started on the same host.
Host have a single NIC with multiple IPs assigned to it.
Each MariaDB instance listen on the separate IP address on the standard port 3306.
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Each instance have identical `server_uid` generated from SHA1(MAC+port)

Suggested solution:
Generate `server_uid` as SHA1(UUID()) at the DATADIR initialization (as a part of mariadb-install-db) and then use it at every startup.