[gPXE] abortpxe.com and gpxe issue

[Viswanath Krishnamurthy]

http://git.etherboot.org/?p=gpxe.git;a=commit;h=b0c3d134284171d844b59128b44a86fa0579ac73

[pxe] Treat PXENV_RESTART_TFTP as unreturnable

The above commit fixed the issue. Basically the abortpxe wants the boot from
next device and not from PXE server.
Without the fix, the wdsnbp.com would load abortpxe. This would return the
control back to wdsnbp.com and it would loop forever. The trick is to return
control back to gPXE.

-Viswa
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