Two More Top Nokia Execs Exit  HELSINKI (Reuters) - Nokia &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NOK1V.HE target=/stocks/quickinfo/fullquote"&gt;NOK1V.HE&lt;/A&gt; said on Friday the  head of its networks unit had resigned and another top networks  executive left, in the second major shake-up of top management  in two weeks at the world's top mobile phone maker.