SSH with ed25519

[Adi Kriegisch]

Dear all,

first off, thank you very much for ssh support! During testing I noticed that 
ed25519 ssh keys were rejected with "Incorrect SSH key - base64 part is not 
ed25519 as claimed but ed25519".
The reason for this is in the condition in lib/ssh.py that hard codes the 
string length of the key type -- 7 or '\x07' -- which fits ssh-rsa and ssh-dss 
but not ssh-ed25519. Find a patch attached that fixes the issue.

Thank you very much for your work on kallithea!

best regards,
	Adi Kriegisch
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