Krispy Kreme Scales Back as Profit Dives  NEW YORK (Reuters) - Krispy Kreme Doughnuts Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=KKD.N target=/stocks/quickinfo/fullquote"&gt;KKD.N&lt;/A&gt; on  Thursday posted sharply lower quarterly earnings, signaled that  the second half of the year would be weak and scaled back store  openings after it was battered by the low-carbohydrate diet  craze.