Added test which checks reading external annotations in old and new formats.

java/java-tests/testData/codeInsight/externalAnnotations/lib/persistence/Test.java

@@ -0,0 +1,9 @@
+package persistence;
+
+import java.util.*;
+
+class Test {
+  String <T> getString(Map.Entry<T, T> entry) {
+    return null;
+  }
+}