Stop using the deprecated Measure method

As what suggested by Ginkgo migration guide, `Measure` node was
deprecated and replaced with `It` node which creates `gmeasure.Experiment`.

Signed-off-by: Dave Chen <dave.chen@arm.com>

vendor/github.com/onsi/gomega/gmeasure/enum_support.go

@@ -0,0 +1,43 @@
+package gmeasure
+
+import "encoding/json"
+
+type enumSupport struct {
+	toString map[uint]string
+	toEnum   map[string]uint
+	maxEnum  uint
+}
+
+func newEnumSupport(toString map[uint]string) enumSupport {
+	toEnum, maxEnum := map[string]uint{}, uint(0)
+	for k, v := range toString {
+		toEnum[v] = k
+		if maxEnum < k {
+			maxEnum = k
+		}
+	}
+	return enumSupport{toString: toString, toEnum: toEnum, maxEnum: maxEnum}
+}
+
+func (es enumSupport) String(e uint) string {
+	if e > es.maxEnum {
+		return es.toString[0]
+	}
+	return es.toString[e]
+}
+
+func (es enumSupport) UnmarshJSON(b []byte) (uint, error) {
+	var dec string
+	if err := json.Unmarshal(b, &dec); err != nil {
+		return 0, err
+	}
+	out := es.toEnum[dec] // if we miss we get 0 which is what we want anyway
+	return out, nil
+}
+
+func (es enumSupport) MarshJSON(e uint) ([]byte, error) {
+	if e == 0 || e > es.maxEnum {
+		return json.Marshal(nil)
+	}
+	return json.Marshal(es.toString[e])
+}