Add IPPool class
Merge branch 'master' of https://github.com/SenguptaS/SASA-DHCP-Server.git
Merge branch 'master' of https://github.com/SenguptaS/SASA-DHCP-Server.git
Merge branch 'master' of https://github.com/SenguptaS/SASA-DHCP-Server.git