singlestat: change threshold check in flot gauge

Fixes #5515. Flot gauge has its own threshold check that is different
from the threshold check in singlestat. This changes the flot check to
be exclusive (same as the singlestat check). E.g. if the threshold is
10, then the value 10 is over the threshold.

public/app/plugins/panel/singlestat/specs/singlestat_panel_spec.ts

@@ -14,11 +14,27 @@ describe('grafanaSingleStat', function() {
         expect(getColorForValue(data, 5)).to.be('green');
       });
 
-      it('25 should return green', () => {
+      it('19.9 should return green', () => {
+        expect(getColorForValue(data, 19.9)).to.be('green');
+      });
+
+      it('20 should return yellow', () => {
+        expect(getColorForValue(data, 20)).to.be('yellow');
+      });
+
+      it('20.1 should return yellow', () => {
+        expect(getColorForValue(data, 20.1)).to.be('yellow');
+      });
+
+      it('25 should return yellow', () => {
         expect(getColorForValue(data, 25)).to.be('yellow');
       });
 
-      it('55 should return green', () => {
+      it('50 should return red', () => {
+        expect(getColorForValue(data, 50)).to.be('red');
+      });
+
+      it('55 should return red', () => {
         expect(getColorForValue(data, 55)).to.be('red');
       });
     });

public/app/plugins/panel/singlestat/specs/singlestat_specs.ts

@@ -108,7 +108,7 @@ describe('SingleStatCtrl', function() {
     });
   });
 
-  singleStatScenario('When range to text mapping is specifiedfor first range', function(ctx) {
+  singleStatScenario('When range to text mapping is specified for first range', function(ctx) {
     ctx.setup(function() {
       ctx.data = [
         {target: 'test.cpu1', datapoints: [[41,50]]}

public/vendor/flot/jquery.flot.gauge.js

@@ -371,7 +371,7 @@
             for (var i = 0; i < gaugeOptionsi.threshold.values.length; i++) {
                 var threshold = gaugeOptionsi.threshold.values[i];
                 color = threshold.color;
-                if (data <= threshold.value) {
+                if (data < threshold.value) {
                     break;
                 }
             }