Vpn Hosts (ad blocker & no roo

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fix a bug on some htc devices
fix a deadlock that may cause OutOfMemoryError or Unable connect to network

full support ipv6.
support add AAAA(ipv6 address)records to hosts file.
example hosts:
//ipv4
192.168..1　www.e.com
//ipv6
:: 　a.com
fc00::1 　www.b.com
fc00:abcd:abcd:abcd:abcd:abcd:abcd:abcd　 .c.com
....