PeopleSoft Ousts CEO Amid Oracle Battle  SAN FRANCISCO/NEW YORK (Reuters) - PeopleSoft Corp.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=PSFT.O target=/stocks/quickinfo/fullquote"&gt;PSFT.O&lt;/A&gt; fired its chief executive Craig Conway on Friday just  hours before U.S. antitrust regulators said they would drop  their case against Oracle Corp.'s &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=ORCL.O target=/stocks/quickinfo/fullquote"&gt;ORCL.O&lt;/A&gt; \$7.7 billion hostile  bid for its software rival.