Use swarming in create_pagesets CT task

ct/go/util/util_test.go

Index: ct/go/util/util_test.go
diff --git a/ct/go/util/util_test.go b/ct/go/util/util_test.go
index 01490ff2b4b55047d3275a977223f8a17119136f..60d42e4222dfedc39e4576d47848b0d14755ba1e 100644
--- a/ct/go/util/util_test.go
+++ b/ct/go/util/util_test.go
@@ -6,6 +6,7 @@ import (
 	"os"
 	"path/filepath"
 	"strconv"
+	"strings"
 	"testing"
 
 	"go.skia.org/infra/go/util"
@@ -85,3 +86,16 @@ func TestCreateTimestampFile(t *testing.T) {
 		t.Error("Unexpected lack of error")
 	}
 }
+
+func TestGetStartRange(t *testing.T) {
+	assert.Equal(t, 1, GetStartRange(1, 1000))
+	assert.Equal(t, 2001, GetStartRange(3, 1000))
+	assert.Equal(t, 41, GetStartRange(3, 20))
+}
+
+func TestGetPathToPyFiles(t *testing.T) {
+	swarmingPath := GetPathToPyFiles(true)
+	assert.True(t, strings.HasSuffix(swarmingPath, filepath.Join("src", "go.skia.org", "infra", "ct", "py")))
+	nonSwarmingPath := GetPathToPyFiles(false)
+	assert.True(t, strings.HasSuffix(nonSwarmingPath, filepath.Join("src", "go.skia.org", "infra", "ct", "py")))
+}