testlib: default nix fixture to also test all daemon protocols (2.5/3)

All tests should have been clear here, but alas

Co-authored-by: eldritch horrors <pennae@lix.systems>
Change-Id: Id642be1f6e0fb714b844ee5348dc096866cf3906

tests/functional2/store/test_ssh_relay.py

@@ -13,7 +13,7 @@ def test_ssh_relay(nix: Nix):
 
     nix.settings.add_xp_feature("nix-command")
 
-    ssh_localhost = "ssh://localhost"
+    ssh_localhost = "ssh://localhost?remote-store=local"
     store = ssh_localhost + 3 * f"?remote-store={ssh_localhost}"
 
     out = nix.nix(["store", "add-path", "--store", store, "hello"]).run().ok().stdout_plain

tests/functional2/testlib/fixtures/nix.py

@@ -445,7 +445,7 @@ def pytest_generate_tests(metafunc: pytest.Metafunc):
     if "nix" not in metafunc.fixturenames or "daemon" in metafunc.fixturenames:
         return
     if not list(metafunc.definition.iter_markers("no_daemon")):
-        protocols = [None, "legacy-combined"]
+        protocols = [None, "legacy-combined", "legacy"]
         # do not enable them the protocols for now
         # protocols += daemon_protocols # noqa ERA001
         ids = protocols