Rearrange stdlib unit tests across packages.

Rearrange JS stdlib unit tests.

libraries/stdlib/test/js/JsArrayScript.kt

@@ -1,5 +1,5 @@
 // this package referenced from testArrayScriptTest
-package jstest
+package test.collections.js
 
 fun testSize(): Int {
     val a1 = arrayOf<String>()

libraries/stdlib/test/js/JsArrayTest.kt

@@ -1,4 +1,4 @@
-package test.collections
+package test.collections.js
 
 import org.junit.Test as test
 import kotlin.test.*

libraries/stdlib/test/js/JsCollectionsTest.kt

@@ -1,4 +1,4 @@
-package test.collections
+package test.collections.js
 
 import java.util.*
 
@@ -8,7 +8,7 @@ import kotlin.comparisons.*
 
 fun <T> List<T>.toArrayList() = this.toCollection(ArrayList<T>())
 
-class JavautilCollectionsTest {
+class JsCollectionsTest {
     val TEST_LIST = arrayOf(2, 0, 9, 7, 1).toList()
     val SORTED_TEST_LIST = arrayOf(0, 1, 2, 7, 9).toList()
     val MAX_ELEMENT = 9

libraries/stdlib/test/js/MapJsTest.kt

@@ -1,10 +1,10 @@
-package test.collections
+package test.collections.js
 
-import test.collections.behaviors.mapBehavior
 import kotlin.test.*
-
-import java.util.*
 import org.junit.Test as test
+import java.util.*
+import test.collections.*
+import test.collections.behaviors.*
 
 class ComplexMapJsTest : MapJsTest() {
     // Helper function with generic parameter to force to use ComlpexHashMap

libraries/stdlib/test/js/SetJsTest.kt

@@ -1,8 +1,9 @@
-package test.collections
+package test.collections.js
 
 import kotlin.test.*
 import org.junit.Test
-import test.collections.behaviors.setBehavior
+import test.collections.*
+import test.collections.behaviors.*
 import java.util.HashSet
 import java.util.LinkedHashSet