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Forcibly enable deprecated OpenSSH KEX algorithm

Philip Cohn-Cort requested to merge philipc/kdeconnect-kde:philipc/openssh-hotfix into master

Summary

The latest releases of OpenSSH (starting with 8.2) do not offer diffie-hellman-group14-sha1 in the default list of key exchange protocols. This in turn breaks SSH access to all Android devices, which is not a good thing.

BUG: 417787

For a long-term solution, we'll need to migrate all clients to a new algorithm.

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