c9066f07c94e3610f7762d6406851cd135790511 Allow running rpc_bind.py --nonloopback test without IPv6 (Kristaps Kaupe)
Pull request description:
Don't see a reason why this can't be tested with IPv4 only.
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Depends on D8133
Backport of Core [[https://github.com/bitcoin/bitcoin/pull/14790 | PR14790]]