Fix the description for when UNDETERMINED is set
Fix the description for when UNDETERMINED is set

The previous description did not match the code in the Threshold
Engine

Change-Id: I2a1306a56458f8d3ab375df7597c0bbfc74657e5

sapcc/monasca-api,sapcc/monasca-api,sapcc/monasca-api,stackforge/monasca-api,stackforge/monasca-api,openstack/monasca-api,stackforge/monasca-api,openstack/monasca-api,stackforge/monasca-api,openstack/monasca-api