itest: limit asset list when asserting mint

AssertAssetsMinted previously listed all confirmed assets known to a
client, then checking that any specific assets (to have been minted in
a specific transaction) were included in this confirmed asset list. The
ListAssets request could time out prematurely if many assets were known
to a client, e.g. in load testing.

This change limits the confirmed assets requested only to whatever was
included in the 0th output of the supplied minting transaction. Any
supplied asset requests are then checked for inclusion in that set.

Author: jtobin

itest/assertions.go

@@ -2093,9 +2093,13 @@ func AssertAssetsMinted(t *testing.T, tapClient commands.RpcClientsBundle,
 		assetList     []*taprpc.Asset
 	)
 
+	// List only the assets that were minted in the anchor transaction.
 	listRespConfirmed, err := tapClient.ListAssets(
 		ctxt, &taprpc.ListAssetRequest{
 			ScriptKeyType: allScriptKeysQuery,
+			AnchorOutpoint: &taprpc.OutPoint{
+				Txid: mintTXID[:],
+			},
 		},
 	)
 	require.NoError(t, err)