* fb49088 fix DNS.SD.Advertise.{i}.TransportProtocol
* b7115a9 Device.DNS.SD.Advertise.{i}.Interface doesn't show a correct reference value
* 94964b4 Device.DNS.SD.Advertise.{i}.InstanceName value is always shown as empty value
* bf29f7b Device.DNS.SD.Advertise.{i}.Alias default value is empty and remains empty even after setting it
* add dependencies for different backends in dhcpmngr and
dnsmngr
* use CFLAG to indicate to data model code which backend is being
used currently
* add uci-defaults script to set leasetrigger if unbound is dns
backend