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/rpc_invalidateblock.py

@@ -8,7 +8,6 @@ from test_framework.test_framework import BitcoinTestFramework
 from test_framework.address import ADDRESS_BCRT1_UNSPENDABLE_DESCRIPTOR
 from test_framework.util import (
     assert_equal,
-    connect_nodes,
 )
 
 
@@ -32,7 +31,7 @@ class InvalidateTest(BitcoinTestFramework):
         assert_equal(self.nodes[1].getblockcount(), 6)
 
         self.log.info("Connect nodes to force a reorg")
-        connect_nodes(self.nodes[0], 1)
+        self.connect_nodes(0, 1)
         self.sync_blocks(self.nodes[0:2])
         assert_equal(self.nodes[0].getblockcount(), 6)
         badhash = self.nodes[1].getblockhash(2)
@@ -43,7 +42,7 @@ class InvalidateTest(BitcoinTestFramework):
         assert_equal(self.nodes[0].getbestblockhash(), besthash_n0)
 
         self.log.info("Make sure we won't reorg to a lower work chain:")
-        connect_nodes(self.nodes[1], 2)
+        self.connect_nodes(1, 2)
         self.log.info("Sync node 2 to node 1 so both have 6 blocks")
         self.sync_blocks(self.nodes[1:3])
         assert_equal(self.nodes[2].getblockcount(), 6)