TestRunner support in test's build.gradle

* Fixes to tests
 * RunKonanTest runs tests build with TestRunner
 * Standalone tests

backend.native/tests/runtime/basic/driver0.kt

@@ -0,0 +1,4 @@
+// TODO: remove kotlin_native.io once overrides are in place.
+fun main(args : Array<String>) {
+    println("Hello, world!")
+}

backend.native/tests/runtime/basic/entry1.kt

@@ -1,5 +1,3 @@
-package runtime.basic.entry1
-
 fun fail() {
     println("Test failed, this is a wrong main() function.")
 }

backend.native/tests/runtime/basic/entry2.kt

@@ -1,5 +1,3 @@
-package runtime.basic.entry2
-
 fun main(args: Array<String>) {
     fail()
 }

backend.native/tests/runtime/basic/initializers2.kt

@@ -1,7 +1,3 @@
-package runtime.basic.initializers2
-
-import kotlin.test.*
-
 class A(val msg: String) {
     init {
         println("init $msg")
@@ -13,7 +9,7 @@ val globalValue1 = 1
 val globalValue2 = A("globalValue2")
 val globalValue3 = A("globalValue3")
 
-@Test fun runTest() {
+fun main(args: Array<String>) {
     println(globalValue1.toString())
     println(globalValue2.toString())
     println(globalValue3.toString())

backend.native/tests/runtime/basic/libentry2.kt

@@ -1,5 +1,3 @@
-package runtime.basic.entry2
-
 fun fail() {
     println("Test failed, this is a wrong main() function.")
 }