VcsManager: Register IVersionControls with VcsManager

Get some more objects out of the pool.

Change-Id: Id93021b712307c4777dc39b9d15aa18a46318885
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cvs/cvsplugin.cpp

@@ -198,7 +198,7 @@ bool CvsPlugin::initialize(const QStringList &arguments, QString *errorMessage)
 
     Context context(CVS_CONTEXT);
 
-    initializeVcs(new CvsControl(this), context);
+    initializeVcs<CvsControl>(context, this);
 
     m_cvsPluginInstance = this;