Wal-Mart Fires 7 Execs, Managers  LOS ANGELES (Reuters) - Wal-Mart Stores Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=WMT.N target=/stocks/quickinfo/fullquote"&gt;WMT.N&lt;/A&gt; fired  three executives and four managers from its Bentonville,  Arkansas headquarters for violating company rules, the company  said on Wednesday.