avoid using class marked as test code

[rethab]

The ServerDataProvider has the following comment:

        /// <summary>
        /// Used for testing. Do not use for product code.
        /// </summary>
        internal IVssServerDataProvider ServerDataProvider
        {
            get
            {
                return m_serverDataProvider;
            }
            set
            {
                // Used for testing
                m_serverDataProvider = value;
            }
        }