Minor: kotlin-test reformat sources, fix test package names

libraries/kotlin.test/junit/src/test/kotlin/JUnitContributorTest.kt

@@ -1,4 +1,4 @@
-package kotlinx.testing.tests
+package kotlin.test.junit.tests
 
 import org.junit.*
 import java.util.concurrent.*

libraries/kotlin.test/testng/src/test/kotlin/TestNGContributorTest.kt

@@ -1,4 +1,4 @@
-package kotlinx.testing.tests
+package kotlin.test.testng.tests
 
 import org.testng.annotations.*
 import org.testng.*