MaintenanceInfo Description should be ignored in comparison

The Open Service Broker spec says that only the Version should be used
when comparing MaintenanceInfo.
openservicebrokerapi/servicebroker#665

We retain the off-spec comparisons of Public and Private, but should
follow the spec for Version and Description

[#167808805]

domain/maintenance_info.go

@@ -10,5 +10,7 @@ type MaintenanceInfo struct {
 }
 
 func (m *MaintenanceInfo) Equals(input MaintenanceInfo) bool {
-	return reflect.DeepEqual(*m, input)
+	return m.Version == input.Version &&
+		m.Private == input.Private &&
+		reflect.DeepEqual(m.Public, input.Public)
 }

domain/maintenance_info_test.go

@@ -50,10 +50,6 @@ var _ = Describe("MaintenanceInfo", func() {
 				domain.MaintenanceInfo{Version: "1.2.0"},
 				domain.MaintenanceInfo{Version: "2.2.2"},
 			),
-			Entry("description field is different",
-				domain.MaintenanceInfo{Description: "amazing"},
-				domain.MaintenanceInfo{Description: "terrible"},
-			),
 			Entry(
 				"all properties are missing in one of the objects",
 				domain.MaintenanceInfo{
@@ -92,6 +88,10 @@ var _ = Describe("MaintenanceInfo", func() {
 				"both struct's are nil",
 				nil,
 				nil),
+			Entry("description field is different",
+				domain.MaintenanceInfo{Description: "amazing"},
+				domain.MaintenanceInfo{Description: "terrible"},
+			),
 		)
 	})
 })