C++: Fix class scope completion for templates.

* You now get completion for std::vector<int>::[complete].
* Also added a test.

Conflicts:
	src/plugins/cpptools/cppcompletion_test.cpp
	src/plugins/cpptools/cpptoolsplugin.h

Change-Id: I596ebf6bd18ec9a347113f8d162cc124c8a0d6b4
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/cpptools/cppcompletionassist.cpp

@@ -1432,6 +1432,13 @@ bool CppCompletionAssistProcessor::completeScope(const QList<CPlusPlus::LookupIt
                 break;
             }
 
+        } else if (Template *templ = ty->asTemplateType()) {
+            if (!result.binding())
+                continue;
+            if (ClassOrNamespace *b = result.binding()->lookupType(templ->name())) {
+                completeClass(b);
+                break;
+            }
         }
     }