[PATCH] net: allow SIOCSIFFLAGS in dev_ioctl()
This patch allows ioctl SIOCSIFFLAGS from VE on PF_INET6 socket.
In old VEs (with redhat-6.2) ifconfig calls ioctl() on IPv6 socket,
while tries to make venet UP inside VE. And fails.
Since this ioctl is prohibited in dev_ioctl(). Newer ifconfig's
call this ioctl() on IPv4 socket and thus end up with inet_ioctl().