National Commerce, Stockholders Settle  NEW YORK (Reuters) - National Commerce Financial  Corp.&lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NCF.N target=/stocks/quickinfo/fullquote"&gt;NCF.N&lt;/A&gt; said on Tuesday it agreed to settle previously  disclosed shareholder class-action lawsuits challenging its  proposed merger with SunTrust Banks, Inc.&lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=STI.N target=/stocks/quickinfo/fullquote"&gt;STI.N&lt;/A&gt;.