We want to add the new mixed+hs-v23-ipv6 chutney network from legacy/trac#33333 to tor's makefile tests: * test-network-all * test-network-ipv6 We'll need some minor refactoring, so that we can test for "ipv6" and "mixed", before using this network. I think the resulting code will be simpler. We can pass the following network lists to the test-network-run target: * unconditional (ipv4 and not mixed) * ipv6 * mixed * mixed_ipv6 Then we can: * test for ipv6 and mixed in separate tests, * set flags for mixed and ipv6, and * skip or use the right network lists.