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/feature_minchainwork.py

@@ -18,7 +18,7 @@ only succeeds past a given node once its nMinimumChainWork has been exceeded.
 import time
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import connect_nodes, assert_equal
+from test_framework.util import assert_equal
 
 # 2 hashes required per regtest block (with no difficulty adjustment)
 REGTEST_WORK_PER_BLOCK = 2
@@ -39,7 +39,7 @@ class MinimumChainWorkTest(BitcoinTestFramework):
         # block relay to inbound peers.
         self.setup_nodes()
         for i in range(self.num_nodes-1):
-            connect_nodes(self.nodes[i+1], i)
+            self.connect_nodes(i+1, i)
 
     def run_test(self):
         # Start building a chain on node0.  node2 shouldn't be able to sync until node1's