test: Disable automatic connections by default

This prevents the node from trying to connect to random IPs on the internet
while running the functional tests. Exceptions are added when required for
the test to pass.

test/functional/feature_anchors.py

@@ -23,6 +23,7 @@ def check_node_connections(*, node, num_in, num_out):
 class AnchorsTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
+        self.disable_autoconnect = False
 
     def setup_network(self):
         self.setup_nodes()