NMS-7238-Citrix-NetScaler-events

Corrected UEI and file name typo
NMS-7238-Citrix-NetScaler-events

Corrected event file entry
Normalized XML format
Use org.ebaysf.web.cors.CORSFilter for CORS support.
Include some documentation and pointers for the CORS filter.
Merge remote-tracking branch 'origin/develop' into features/cors-support
Merge pull request #1 from indigo423/patch-7

NMS-7238: Citrix-NetScaler-events
Merge remote-tracking branch 'origin/develop' into features/cors-support
Merge branch 'features/cors-support' into develop
Merge pull request #184 from mfuhrmann/NMS-7238-Citrix-NetScaler-events

NMS-7238: Fix UEI names for CitrixNetScaler trap events
- Renamed Netscalar.events.xml to CitrixNetScaler.events.xml
- Renamed event UEI's from Netscalar to citrix/netscaler
- Normalized XML file with 4 spaces for indentation