Use ipaddress.ip_address for storing IPv4/IPv6

[bswck]

For the Address class,

bt-ddos-shield/bt_ddos_shield/address.py

Lines 14 to 30 in c8e6b96

	class Address(ABC):
	"""
	Class describing address, which redirects to original miner's server.
	"""
	def __init__(self, address_id, address_type: AddressType, address: str, port: int):
	"""
	Args:
	address_id: Identifier (used by AddressManager) of the address. Type depends on the implementation.
	address_type: Type of the address.
	address: Address.
	port: Port of the address.
	"""
	self.address_id = address_id
	self.address_type = address_type
	self.address = address
	self.port = port

let's use what ip_address provides us in order to validate and reliably store IP address information.

[ggleszczynski]

This IP and IPv6 AddressType is used only in miner_address param passed when creating AddressManager instance and is used just for finding EC2 server with given IP - it is agreed with @ppolewicz that we are shielding only EC2 server as for now. See AddressManager::_initialize_miner_instance where it is done. There is no need to use ipaddress library for anything there.