Move all basic completion tests to common folder

idea/testData/completion/basic/common/BeforeDotInCall.kt

@@ -0,0 +1,19 @@
+package testing
+
+fun testTop() {
+
+}
+
+class TestSample() {
+    fun main(args : Array<String>) {
+        val testVar = ""
+        test<caret>.testFun()
+    }
+
+    fun testFun() {
+
+    }
+}
+
+// TIME: 2
+// EXIST: testVar, testFun, testTop