c603ce8 A couple of sftp fixes from upstream

Authored and Committed by pghmcfc 6 years ago
    A couple of sftp fixes from upstream
    
    - mod_sftp failed to check shadow password information when publickey
      authentication used (http://bugs.proftpd.org/show_bug.cgi?id=4308)
    - Use of "AllowEmptyPasswords off" broke SFTP/SCP logins
      (http://bugs.proftpd.org/show_bug.cgi?id=4309)
    
        
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