Rename *-private-ipv4 to *-private-ip CLI args (#13208)

* Rename `*-private-ipv4` to `*-private-ip` CLI args

Renames the `*-private-ipv4` to `*-private-ip` in the CLI interface. The old names are staying as
alias, thus it will not break for anyone. Besides that it also fixes the naming in the rest of the code.

* FMT

substrate/client/service/test/src/lib.rs

@@ -220,7 +220,7 @@ fn node_config<
 	);
 
 	network_config.transport =
-		TransportConfig::Normal { enable_mdns: false, allow_private_ipv4: true };
+		TransportConfig::Normal { enable_mdns: false, allow_private_ip: true };
 
 	Configuration {
 		impl_name: String::from("network-test-impl"),