scripted-diff: Use generate* from TestFramework

-BEGIN VERIFY SCRIPT-
 sed --regexp-extended -i \
     's/((self\.)?(nodes\[[^]]+\]|[a-z_]*(wallet|node)[0-9a-z_]*))\.(generate(|toaddress|block|todescriptor)(\(|, ))/self.\5\1, /g' \
     $(git grep -l generate ./test | grep -v 'test_framework/' | grep -v 'feature_rbf')
-END VERIFY SCRIPT-

test/functional/mempool_unbroadcast.py

@@ -109,7 +109,7 @@ class MempoolUnbroadcastTest(BitcoinTestFramework):
         # a block
         removal_reason = "Removed {} from set of unbroadcast txns before confirmation that txn was sent out".format(txhsh)
         with node.assert_debug_log([removal_reason]):
-            node.generate(1)
+            self.generate(node, 1)
 
 if __name__ == "__main__":
     MempoolUnbroadcastTest().main()