refactored lab3 for Mininet 2.0 API, changed IPCONFIG_FILE path, and refactored get_ip_setting()
refactored lab3 for Mininet 2.0 API, changed IPCONFIG_FILE path, and refactored get_ip_setting()

somethingnew2-0/CS640-PA3,somethingnew2-0/CS640-PA3,somethingnew2-0/CS640-PA3