NMS-6746: Improve readability SnmpMonitor

- Table for Operation mode reformatted in source
- Description table shortened
- Operator description added force line breaks
- Changed snmp-config.xml format as file
- Reformatted examples and the used OIDs
- Renamed the example service from All_Static_Routes to All-Static-Routes to look less like source code
NMS-6746 Documentation SnmpMonitor

- Reviewer comments
Merge pull request #78 from indigo423/NMS-6746-Improve-readability-SnmpMonitor

NMS-6746: Improve readability SnmpMonitor