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

* commit 'c21f84dddbe8144bb3d392b3b91c6df5f48aed42':
  DHCPv4: lease expiration is fatal, renew failures are not

Change-Id: Ic99edb732d532da27c042824e5ca07c4b35ccfa1