This reverts commit 463e910119813aaea0755ff5c16c91ce412a8cbb. This change causes the entire static lease to get deleted when attempting to change the MAC address. Signed-off-by: Jo-Philipp Wich <jo@mein.io> (cherry picked from commit 91f46d765b36825fcfe63e2b7d4863de00cdc69d)