keeps defaults in CreateClientOptions but makes shares-* required?

src/allmydata/scripts/create_node.py

@@ -288,6 +288,8 @@ def write_node_config(c, config):
 
 
 def write_client_config(c, config):
+    # note, config can be a plain dict, it seems -- see
+    # test_configutil.py in test_create_client_config
     c.write("[client]\n")
     c.write("# Which services should this client connect to?\n")
     introducer = config.get("introducer", None) or ""

src/allmydata/test/test_configutil.py

@@ -88,6 +88,9 @@ class ConfigUtilTests(GridTestMixin, unittest.TestCase):
                     "webport": "tcp:3456",
                     "hide-ip": False,
                     "listen": "none",
+                    "shares-needed": "1",
+                    "shares-happy": "1",
+                    "shares-total": "1",
                     }
             create_node.write_node_config(f, opts)
             create_node.write_client_config(f, opts)