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Fix utils functions with invalid ip/cidr inputs
- add test cases reported in #5131
- fix utils functions
address_in_network,is_ipv4_addressandis_valid_cidr - replace socket with
ipaddressmodule - prepare ipv6 support
Fixes #5131
@kennethreitz, @Lukasa, @sigmavirus24, @nateprewitt, @slingamn,
This is my first contribution to this project, and I don't know if is necessary request to someone to review the PR