Refactor serialization tests and move them to test/io package

Add tests for singleton deserializing.

libraries/stdlib/test/utils/LazyJVMTest.kt

@@ -9,6 +9,7 @@ import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.atomic.AtomicInteger
 import kotlin.concurrent.thread
 import org.junit.Test
+import test.io.serializeAndDeserialize
 
 class LazyJVMTest {
 
@@ -85,19 +86,4 @@ class LazyJVMTest {
             assertEquals(lazy.value, lazy2.value)
         }
     }
-
-
-    private fun <T> serializeAndDeserialize(value: T): T {
-        val outputStream = ByteArrayOutputStream()
-        val objectOutputStream = ObjectOutputStream(outputStream)
-
-        objectOutputStream.writeObject(value)
-        objectOutputStream.close()
-        outputStream.close()
-
-        val inputStream = ByteArrayInputStream(outputStream.toByteArray())
-        val inputObjectStream = ObjectInputStream(inputStream)
-        return inputObjectStream.readObject() as T
-    }
-
 }