Merge #15159: [RPC] Remove lookup to UTXO set from GetTransaction

04da9f4834 [RPC] Update getrawtransaction interface (Amiti Uttarwar)

Pull request description:

  - stop checking unspent UTXOs for a transaction when txindex is not enabled, as per conversation here: https://github.com/bitcoin/bitcoin/issues/3220#issuecomment-377458383
  - code contributed by sipa

Tree-SHA512: aa07353bccc14b81b7803992a25d076d6bc06d15ec7c1b85828dc10aea7e0498d9b49f71783e352ab8a14b0bb2010cfb7835de3dfd1bc6f2323f460449348e66

test/functional/interface_rest.py

@@ -41,7 +41,8 @@ class RESTTest (BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
-        self.extra_args = [["-rest"], []]
+        # TODO: remove -txindex. Currently required for getrawtransaction call.
+        self.extra_args = [["-rest", "-txindex"], []]
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()