Need to implement server_firewall command

Send command to change firewall settings

pps - The Integer of incoming ICMP, UDP, TCP joins per second (1000 - 5000).
pps_icmp - The Integer of ICMP packets per second (0 or 10 - 500).
pps_udp - The Integer of UDP packets per second (0 or 10 - 500).
pps_syn - The Integer of TCP SYN packets per second from one IP (0 or 2 - 20).
connlimit - The Integer of collateral connections from one IP (0 or 16 - 512).

Returns The Hash of new firewall settings.