Will only listen for dhcp ACK for non management interfaces.

Will listen for dhcp OFFER REQUEST DECLINE ACK RELEASE for management interfaces
Add comments!
ie:
# Listening only for DHCPACK message type on every configured interface(s) that are not a 'management' one (We can get the information we want from the DHCPACK)
# We need to listen for all DHCP message type on the 'management' interface(s) since they are used for remote networks and in those cases, if PacketFence is not the DHCP server on these networks, we only get the information we want from DHCPREQUEST (ACK from another DHCP server in layer 3 will be unicast so PacketFence won't see it)