Generated /etc/xenopsd.conf has
vif-script=/opt/xensource/libexec/vif
vif-xl-script=/opt/xensource/libexec/vif
vbd-script=/opt/xensource/libexec/block
vbd-xl-script=/opt/xensource/libexec/block
qemu-vif-script=/opt/xensource/libexec/qemu-vif-script
setup-vif-rules=/opt/xensource/libexec/setup-vif-rules
but those are installed in /usr/lib/xenopsd/ instead