增加对域名的扫描

[yaoyi2008]

RT，有时候有扫描域名的情况，可以考虑支持域名方式扫描，或者ip.ini方式加载多个域名扫描哈，现在扫描域名会报错。

Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "fscan.py", line 45, in run
self.Sock.sendto(self.packet, (ip, 0))
gaierror: [Errno -2] Name or service not known