phosphor-network: does it make sense to disable systemd-networkd sending DHCP release?

[Heyi Guo]

Hi all,

Now systemd-networkd will send DHCP release packet when BMC reboots. 
This may cause BMC to lose its original aquired IP after next boot up. I 
see this feature can be disabled by adding below lines to the 
configuration file of systemd-networkd:

[DHCPv4]
SendRelease=false

Does it make sense to disable DHCP release? Or is there any reason for 
the current default configuration in phosphor-network?

Thanks,

Heyi