Add user key actions to admins.
Reuse show page for user keys.
Add feature spec for user ssh keys on admin page.
Move user key manipulation in admin section to a separate controller.
Share the key table between admin and profile resources.
Fix the ssh keys test.
Merge branch 'user_ssh_keys_on_admin' into 'master'

User ssh keys on admin

Show user ssh keys on admin user page.

See merge request !1362