Wall St. Seen Flat at Open as Oil Eyed  LONDON (Reuters) - Wall Street was expected to start little  changed on Friday as investors continue to fret over the impact  of high oil prices on earnings, while Boeing &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=BA.N target=/stocks/quickinfo/fullquote"&gt;BA.N&lt;/A&gt; will be  eyed after it reiterated its earnings forecast.