Vendor psutils and remove neko

plugins/system/ps/load/load_test.go

@@ -0,0 +1,30 @@
+package load
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestLoad(t *testing.T) {
+	v, err := LoadAvg()
+	if err != nil {
+		t.Errorf("error %v", err)
+	}
+
+	empty := &LoadAvgStat{}
+	if v == empty {
+		t.Errorf("error load: %v", v)
+	}
+}
+
+func TestLoadAvgStat_String(t *testing.T) {
+	v := LoadAvgStat{
+		Load1:  10.1,
+		Load5:  20.1,
+		Load15: 30.1,
+	}
+	e := `{"load1":10.1,"load5":20.1,"load15":30.1}`
+	if e != fmt.Sprintf("%v", v) {
+		t.Errorf("LoadAvgStat string is invalid: %v", v)
+	}
+}