2. Sync HSD #210249 patch: Fix bug in handling certain network errors in EfiDhcp4TransmitReceive() for DHCP4 driver 3. Enhance DhcpCleanLease to clear Netmask as well, so that Dhcp4->GetModeData() could return clean data in Dhcp4Stopped state. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9354 6f19259b-4bc3-4df7-8a09-765794883524