Add Erwan Velu as contributor for the tftp boot patches.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2451 c046a42c-6fe2-441c-8c8c-71466251a162

Changelog

-  - TFTP booting from host directory (Anthony Liguori)
+  - TFTP booting from host directory (Anthony Liguori, Erwan Velu)
   - Tap device emulation for Solaris (Sittichai Palanisong)
   - Monitor multiplexing to several I/O channels (Jason Wessel)