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/wallet_keypool_topup.py

@@ -16,7 +16,6 @@ import shutil
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
-    connect_nodes,
 )
 
 
@@ -38,9 +37,9 @@ class KeypoolRestoreTest(BitcoinTestFramework):
         self.stop_node(1)
         shutil.copyfile(wallet_path, wallet_backup_path)
         self.start_node(1, self.extra_args[1])
-        connect_nodes(self.nodes[0], 1)
-        connect_nodes(self.nodes[0], 2)
-        connect_nodes(self.nodes[0], 3)
+        self.connect_nodes(0, 1)
+        self.connect_nodes(0, 2)
+        self.connect_nodes(0, 3)
 
         for i, output_type in enumerate(["legacy", "p2sh-segwit", "bech32"]):
 
@@ -72,7 +71,7 @@ class KeypoolRestoreTest(BitcoinTestFramework):
             self.stop_node(idx)
             shutil.copyfile(wallet_backup_path, wallet_path)
             self.start_node(idx, self.extra_args[idx])
-            connect_nodes(self.nodes[0], idx)
+            self.connect_nodes(0, idx)
             self.sync_all()
 
             self.log.info("Verify keypool is restored and balance is correct")