NMS-6822: Add WMI support for Paging-Disk I/O-Total Memory

- Added metrics for Paging
  - PagesInputPerSec
  - PagesOutputPerSec
  - PagesPerSec
- Added metrics for Disk I/O
  - DiskTransfersPerSec
  - AvgDiskSecPerTransfer
  - CurrentDiskQueueLength
  - AvgDiskQueueLength
  - PercentDiskTime
  - PercentIdleTime
- Total Memory
  - TotalVisibleMemorySize
- Added graph definitions for Paging in wmi.memory.hardfaults-graph.properties
- Added graph definitions for Disk I/O in wmi.physdisk.transrates-graph.properties, wmi.physdisk.busyidletime-graph.properties, wmi.physdisk.queuelength-graph.properties, wmi.physdisk.transrates-graph.properties, 
- Added graph definition for Total Memory in wmi.memory.totalphysical-graph.properties, 

JIRA: http://issues.opennms.org/browse/NMS-6822

Todo: 
- [x] XML formatting
- [x] Run configTesterTest
- [x] Run integration-tests
- [ ] Close JIRA issue with merge