Commit regarding to NMS-5918 and NMS-5919

- Extended RrdGraphController to handle width and height parameter.
- Extended RrdGraphService interface to allow width and height.
- Extended DefaultRrdGraphService to provide width and height and deal
  width already predefined RRD command with a given --width and --height
- Changed results.jsp to use the parameter width and height from prefab graph
  definition
Merge remote-tracking branch 'origin/1.12'

Conflicts:
	opennms-webapp/src/main/java/org/opennms/web/svclayer/support/DefaultRrdGraphService.java