how to place file inside /sbin/ in MAC 10.11 during .pkg installation
wim-deblauwe's comment links to Release &amp; Renew DHCP from the Command Line with ipconfig which shows how to do this:


  The basic syntax to renew DHCP lease from the command line with
  ipconfig is as follows:

sudo ipconfig set (DEVICEINTERFACE) DHCP

  
  If you know the device interface (en0, en1, en2, etc), just run that
  command to release and then renew DHCP for the determined device.
  Let’s say it’s en0, standard for modern Macs with wi-fi only.

sudo ipconfig set en0 DHCP



Do not use setuid on OS X. This approach is considered a security risk and Apple appears to be working to invalidate any justification for it.

Any script or tool you create will need to acquire the appropriate authorisation rights before calling the related API.