Support IP ranges in INTERNAL_IPS

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class CIDR_LIST(list):
    def __init__(self, cidrs):
        self.cidrs = []
        try:
            #http://cheeseshop.python.org/pypi/IPv4_Utils/0.35
            import ipv4
            for cidr in cidrs:
                self.cidrs.append(ipv4.CIDR(cidr))
        except ImportError:
            pass
    def __contains__(self, ip):
        import ipv4
        try:
            for cidr in self.cidrs:
                if ipv4.CIDR(ip) in cidr:
                    return True
        except:
            pass
        return False

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