MAINTAINERS: Stephen Hemminger email change

I changed my email because the vyatta.com mail server is now
redirected to brocade.com; and the Brocade mail system
is not friendly to Linux desktop users.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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