Merge #20852: net: allow CSubNet of non-IP networks

39b43298d9c54f9c18bef36f3d5934f57aefd088 test: add test for banning of non-IP addresses (Vasil Dimov)
94d335da7f8232bc653c9b08b0a33b517b4c98ad net: allow CSubNet of non-IP networks (Vasil Dimov)

Pull request description:

  Allow creation of valid `CSubNet` objects of non-IP networks and only
  match the single address they were created from (like /32 for IPv4 or
  /128 for IPv6).

  This fixes a deficiency in `CConnman::DisconnectNode(const CNetAddr& addr)`
  and in `BanMan` which assume that creating a subnet from any address
  using the `CSubNet(CNetAddr)` constructor would later match that address
  only. Before this change a non-IP subnet would be invalid and would not
  match any address.

ACKs for top commit:
  jonatack:
    Code review re-ACK 39b43298d9c54f9c18bef36f3d5934f57aefd088 per `git diff 5e95ce6 39b4329`; only change since last review is improvements to the functional test; verified the test fails on master @ 616eace0 where expected (`assert(self.is_banned(node, tor_addr))` fails and unban unfails)
  laanwj:
    code review ACK 39b43298d9c54f9c18bef36f3d5934f57aefd088

Tree-SHA512: 3239b26d0f2fa2d1388b4fdbc1d05ce4ac1980be699c6ec46049409baefcb2006b1e72b889871e2210e897f6725c48e873f68457eea7e6e4958ab4f959d20297

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