Merge "DHCPv4: lease expiration is fatal, renew failures are not" into nyc-dev am: 42a5755916 am: 81092a2de8
am: 3c0c9b0f59

* commit '3c0c9b0f59233329e5a085598f0f1678ac717df0':

Change-Id: Id5a57f95fcf00474fb14569c66a8bdd4a7b2d903