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Fix generating SSH key fingerprints with OpenSSH 6.8.

Ramya Authappan requested to merge github/fork/sstanovnik/openssh_fix into master

Created by: sstanovnik

OpenSSH 6.8 introduces a new feature that changes the default fingerprint format and algorithm used by ssh-keygen. This breaks adding new SSH keys, because GitLab expects the colon-delimited format.

The message the user sees on the Add an SSH Key screen is "Fingerprint cannot be generated", similar to #7413, but the underlying cause is different.

This change checks the OpenSSH version and explicitly specifies the previous format if needed.

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