Move Android IDEA plugin tests to android-idea-plugin module

plugins/android-idea-plugin/testData/android/completion/multiFile/multiFile.kt

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+package com.myapp
+
+import android.app.Activity
+
+
+class MyActivity: Activity() {
+    val button = this.log<caret>
+}
+
+// EXIST: login, loginButton

plugins/android-idea-plugin/testData/android/completion/multiFile/res/layout/layout.xml

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+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+             xmlns:tools="http://schemas.android.com/tools"
+             android:id="@+id/item_detail_container"
+             android:layout_width="match_parent"
+             android:layout_height="match_parent"
+             tools:context=".ItemDetailActivity"
+             tools:ignore="MergeRootFrame" >
+
+
+    <TextView
+        android:id="@+id/textView1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Enter your password" />
+
+    <EditText
+        android:id="@+id/password"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:ems="10"
+        android:inputType="textPassword" />
+
+    <Button
+        android:id="@+id/login"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Sign in" />
+
+</FrameLayout>

plugins/android-idea-plugin/testData/android/completion/multiFile/res/layout/layout1.xml

@@ -0,0 +1,29 @@
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+             xmlns:tools="http://schemas.android.com/tools"
+             android:id="@+id/frameLayout"
+             android:layout_width="match_parent"
+             android:layout_height="match_parent"
+             tools:context=".ItemDetailActivity"
+             tools:ignore="MergeRootFrame" >
+
+
+    <TextView
+        android:id="@+id/passwordField"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Enter your password" />
+
+    <EditText
+        android:id="@+id/passwordCaption"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:ems="10"
+        android:inputType="textPassword" />
+
+    <Button
+        android:id="@+id/loginButton"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Sign in" />
+
+</FrameLayout>