NMS-6799: Add OpenSSH Syslog message authentication refused

- Added ueiMatch for authenticationRefused Syslog message to existing OpenSSH.syslog.xml
- Added event definition for authenticationRefused to existing OpenSSH.syslog.events.xml

JIRA: http://issues.opennms.org/browse/NMS-6799

Todo: 
- [x] XML formatting
- [x] Run configTesterTest
- [x] Review proposed pull requests
- [x] Merge