Computer Associates Names IBM Exec as CEO  NEW YORK (Reuters) - Computer Associates International Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CA.N target=/stocks/quickinfo/fullquote"&gt;CA.N&lt;/A&gt; on Tuesday named former IBM software sales head John  Swainson as president and chief executive, seven months after  Sanjay Kumar stepped down amid an accounting scandal.