Import: IDE should import class from root package

#KT-21422 Fixed

idea/testData/quickfix/autoImports/importFromRoot.after.kt

@@ -0,0 +1,9 @@
+// "Import" "true"
+// ERROR: Unresolved reference: RootClass
+package non.root.name
+
+import RootClass
+
+fun test() {
+    RootClass()
+}

idea/testData/quickfix/autoImports/importFromRoot.before.Dependency.kt

@@ -0,0 +1 @@
+class RootClass

idea/testData/quickfix/autoImports/importFromRoot.before.Main.kt

@@ -0,0 +1,7 @@
+// "Import" "true"
+// ERROR: Unresolved reference: RootClass
+package non.root.name
+
+fun test() {
+    RootClass<caret>()
+}