As described in https://bugs.launchpad.net/puppet-ironic/+bug/1714320,
a loop can occur in which dnsmasq always indicates ipxe.efi as the
bootfile if the client request has both UEFI and iPXE options set.
This fixes the documentation for the example dnsmasq.conf so that
loop won't occur.
In addition, some UEFI clients use architecture type 9 so that is
added to the example dnsmasq.conf.
Related-Bug: 1714320
Change-Id: Icdefba2b1be47622c9bd9c3bfb9b3413964c9dac
25929f3d04