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For DHCPv6 PXE boot, the Client Architecture option uses code 61, see https://tools.ietf.org/html/rfc5970#section-3.3. Use this to determine if booting over EFI and set the DHCPv6 bootfile-url when booting PXE over EFI. Change-Id: I096ac412c015c3ac488d712010aafe52b572cfad