IDEA-65747 Javadoc: Don't use attribute value on javadoc tag autocompletion

1. Tag name only is used during javadoc tag auto completion;
2. Corresponding test is added;
3. java-impl module config file is corrected in order to define test source root;

java/java-impl/testSrc/com/intellij/codeInsight/editorActions/JavadocTypedHandlerTest.java

@@ -37,6 +37,12 @@ public class JavadocTypedHandlerTest {
     doTest("<t\nag><caret>", null);
   }
   
+  @Test
+  public void tagWithAttribute() {
+    doTest("<a href='www'><caret>", "a");
+    //TODO den implement
+  }
+  
   private static void doTest(String text, String expected) {
     StringBuilder normalized = new StringBuilder();
     int offset = text.indexOf(CARET_MARKER);