[768342] Incorrect work of Resource Group Metric Graph portlet
The datasouce backing this select item had issues.  Fixed that. Also,
fix a tangential issue in the MeasurementScheduleCriteria resource type
filter.

(cherry picked from commit 16c6dbf7d3fc6d1a2614cd34b255853e09f0be45)
Conflicts:
	modules/enterprise/gui/coregui/src/main/java/org/rhq/coregui/client/inventory/resource/detail/monitoring/ResourceScheduledMetricDatasource.java