NMS-7238: Fix UEI names for CitrixNetScaler trap events

JIRA: http://issues.opennms.org/browse/NMS-7238

My first task was to add new events. But ONMS already provided these events. But I fixed typos and corrected the file name.

Todo: 
- [x] XML formatting
- [x] Run configTesterTest
- [x] 4-eye review
- [ ] Close JIRA issue after merge