Fixes #8727 - DHCP validation does not fail on discovered leases
(cherry picked from commit 37bb1b44a9753382c6858e22ac55031e9662c4e4)
Fixes #8727 - DHCP validation does not fail on discovered leases
(cherry picked from commit 37bb1b44a9753382c6858e22ac55031e9662c4e4)