test_submitpackage: only make a chain of 3 txns

Author: instagibbs

test/functional/rpc_packages.py

@@ -336,7 +336,7 @@ def test_submitpackage(self):
         self.log.info("Submitpackage only allows packages of 1 child with its parents")
         # Chain of 3 transactions has too many generations
         legacy_pool = node.getrawmempool()
-        chain_hex = [t["hex"] for t in self.wallet.create_self_transfer_chain(chain_length=25)]
+        chain_hex = [t["hex"] for t in self.wallet.create_self_transfer_chain(chain_length=3)]
         assert_raises_rpc_error(-25, "package topology disallowed", node.submitpackage, chain_hex)
         assert_equal(legacy_pool, node.getrawmempool())