Merge "DHCPv4: lease expiration is fatal, renew failures are not" into nyc-dev am: c21f84dddb
am: 8958153ac7

* commit '8958153ac7921349dd8770a33484ca96581277cc':
  DHCPv4: lease expiration is fatal, renew failures are not

Change-Id: I314ceed6380af58fb3f6308dde11f2d29b324c66