test: Remove darwin hardcoded parallel limit

On darwin parallel was limited to 2 instead of nproc/1.75.  Hopefully
this will speed up integration tests that take about 1 hour with the
hard coded limit.

test/integration/main_test.go

@@ -97,16 +97,11 @@ func setMaxParallelism() {
 	// Each "minikube start" consumes up to 2 cores, though the average usage is somewhat lower
 	limit := int(math.Floor(float64(maxp) / 1.75))
 
-	// Windows and MacOS tests were failing from timeouts due to too much parallelism
+	// Windows tests were failing from timeouts due to too much parallelism
 	if runtime.GOOS == "windows" {
 		limit /= 2
 	}
 
-	// Hardcode limit to 2 for macOS
-	if runtime.GOOS == "darwin" {
-		limit = 2
-	}
-
 	fmt.Fprintf(os.Stderr, "Found %d cores, limiting parallelism with --test.parallel=%d\n", maxp, limit)
 	if err := flag.Set("test.parallel", strconv.Itoa(limit)); err != nil {
 		fmt.Fprintf(os.Stderr, "Unable to set test.parallel: %v\n", err)