eliminate convert in bgp module and minor bug fixes
refine gateway module with netaddr
improve config file naming
repair parameter naming
NLRI parse bug fix
rename parameter in method calls
use netaddr.EUI as the internal representation of MAC address
remove `convert` in routing
now finished `handle_arp` thread
changed other methods to use `netaddr`, need test
clean 'convert' module
parenthesis fix
appease pyCharm warnings
"send packet out of AS" procedure overhaul