Android N MR2 Preview 2
dhcp client: create class SocketUtil to simplify class DHCPV4 am: 702e099
am: 1ef994e

* commit '1ef994e226f95a71c494425edb1d42fe0352003c':
  dhcp client: create class SocketUtil to simplify class DHCPV4

Change-Id: Ib95effbbedf0767816167473f0f4c323425006fd