Log Message:
Import dhcpcd-7.0.0-rc1 with the following changes:
  *  Default to use VLANID>0 for IAID instead of MAC address
  *  BSD: Add support for RTA_LABEL
  *  Stop sharing the DHCPv6 port in master mode with other processes
  *  Fix some prefix delegation issues when the carrier drops or
     addresses become stale
  *  Fix a crash when starting dhcpcd with -n
  *  Fix test for preferring a fake lease over a real one
  *  Show to real address lifetimes being added when adding IPv6
     addresses
  *  Install dhcpcd-definitions.conf to the correct directory
  *  Restore the -G, --nogateway option