Rewrite MultiplatformProjectImportingTest to use testData directory

idea/testData/gradle/multiplatform/jsTestOutputFile/build.gradle

@@ -0,0 +1,28 @@
+buildscript {
+    repositories {
+        jcenter()
+        maven { url 'https://maven.google.com' }
+    }
+
+    dependencies {
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.51")
+        classpath 'com.android.tools.build:gradle:2.3.3'
+    }
+}
+
+project('project1') {
+    apply plugin: 'kotlin-platform-common'
+}
+
+project('project2') {
+    repositories {
+        mavenCentral()
+    }
+
+    apply plugin: 'kotlin-platform-js'
+
+    dependencies {
+        implement project(':project1')
+    }
+}
+        

idea/testData/gradle/multiplatform/jsTestOutputFile/settings.gradle

@@ -0,0 +1 @@
+include ':project1', ':project2', ':project3'