Merge changes I2cea553a,Id8d3dcf6,I19e68e88,I35598935,Idd7dc369, ...

* changes:
  Add a SharedLog method to log errors w/ stacktrace
  Add DhcpServingParams
  Add fields to DHCP packets for server use-case
  Add util to add an ARP table entry
  Add DHCP utils extracted from DhcpClient
  Add DhcpLeaseRepository