scripted-diff: test: Replace uses of (dis)?connect_nodes global

-BEGIN VERIFY SCRIPT-

 # max-depth=0 excludes test/functional/test_framework/...
 FILES=$(git grep -l --max-depth 0 "connect_nodes" test/functional)

 # Replace (dis)?connect_nodes(self.nodes[a], b) with self.(dis)?connect_nodes(a, b)
 sed -i 's/\b\(dis\)\?connect_nodes(self\.nodes\[\(.*\)\]/self.\1connect_nodes(\2/g' $FILES

 # Remove imports in the middle of a line
 sed -i 's/\(dis\)\?connect_nodes, //g' $FILES
 sed -i 's/, \(dis\)\?connect_nodes//g' $FILES

 # Remove imports on a line by themselves
 sed -i '/^\s*\(dis\)\?connect_nodes,\?$/d' $FILES
 sed -i '/^from test_framework\.util import connect_nodes$/d' $FILES

-END VERIFY SCRIPT-

Co-authored-by: Elliott Jin <elliott.jin@gmail.com>

test/functional/p2p_segwit.py

@@ -81,8 +81,6 @@ from test_framework.script import (
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
-    connect_nodes,
-    disconnect_nodes,
     softfork_active,
     hex_str_to_bytes,
     assert_raises_rpc_error,
@@ -233,8 +231,8 @@ class SegWitTest(BitcoinTestFramework):
 
     def setup_network(self):
         self.setup_nodes()
-        connect_nodes(self.nodes[0], 1)
-        connect_nodes(self.nodes[0], 2)
+        self.connect_nodes(0, 1)
+        self.connect_nodes(0, 2)
         self.sync_all()
 
     # Helper functions
@@ -498,7 +496,7 @@ class SegWitTest(BitcoinTestFramework):
         # node2 doesn't need to be connected for this test.
         # (If it's connected, node0 may propagate an invalid block to it over
         # compact blocks and the nodes would have inconsistent tips.)
-        disconnect_nodes(self.nodes[0], 2)
+        self.disconnect_nodes(0, 2)
 
         # Create two outputs, a p2wsh and p2sh-p2wsh
         witness_program = CScript([OP_TRUE])
@@ -560,7 +558,7 @@ class SegWitTest(BitcoinTestFramework):
             # TODO: support multiple acceptable reject reasons.
             test_witness_block(self.nodes[0], self.test_node, block, accepted=False, with_witness=False)
 
-        connect_nodes(self.nodes[0], 2)
+        self.connect_nodes(0, 2)
 
         self.utxo.pop(0)
         self.utxo.append(UTXO(txid, 2, value))
@@ -1945,7 +1943,7 @@ class SegWitTest(BitcoinTestFramework):
         """Test the behavior of starting up a segwit-aware node after the softfork has activated."""
 
         self.restart_node(2, extra_args=["-segwitheight={}".format(SEGWIT_HEIGHT)])
-        connect_nodes(self.nodes[0], 2)
+        self.connect_nodes(0, 2)
 
         # We reconnect more than 100 blocks, give it plenty of time
         self.sync_blocks(timeout=240)