Return correct error codes in bumpfee().

The bumpfee() RPC was returning misleading or incorrect error codes
(for example RPC_INVALID_ADDRESS_OR_KEY when the transaction was not
BIP125 replacable). This commit fixes those error codes:

- RPC_INVALID_ADDRESS_OR_KEY if an invalid address was provided:
    - Invalid change address given
- RPC_INVALID_PARAMETER if a single (non-address/key) parameter is incorrect
    - confTarget and totalFee options should not both be set.
    - Invalid confTarget
    - Insufficient totalFee (cannot be less than required fee)
- RPC_WALLET_ERROR for any other error
    - Transaction has descendants in the wallet
    - Transaction has descendants in the mempool
    - Transaction has been mined, or is conflicted with a mined transaction
    - Transaction is not BIP 125 replaceable
    - Transaction has already been bumped
    - Transaction contains inputs that don't belong to the wallet
    - Transaction has multiple change outputs
    - Transaction does not have a change output
    - Fee is higher than maxTxFee
    - New fee rate is less than the minimum fee rate
    - Change output is too small.

This commit also updates the test cases to explicitly test the error code.

qa/rpc-tests/bumpfee.py

@@ -128,7 +128,7 @@ def test_segwit_bumpfee_succeeds(rbf_node, dest_address):
 def test_nonrbf_bumpfee_fails(peer_node, dest_address):
     # cannot replace a non RBF transaction (from node which did not enable RBF)
     not_rbfid = create_fund_sign_send(peer_node, {dest_address: 0.00090000})
-    assert_raises_message(JSONRPCException, "not BIP 125 replaceable", peer_node.bumpfee, not_rbfid)
+    assert_raises_jsonrpc(-4, "not BIP 125 replaceable", peer_node.bumpfee, not_rbfid)
 
 
 def test_notmine_bumpfee_fails(rbf_node, peer_node, dest_address):
@@ -148,7 +148,7 @@ def test_notmine_bumpfee_fails(rbf_node, peer_node, dest_address):
     signedtx = rbf_node.signrawtransaction(rawtx)
     signedtx = peer_node.signrawtransaction(signedtx["hex"])
     rbfid = rbf_node.sendrawtransaction(signedtx["hex"])
-    assert_raises_message(JSONRPCException, "Transaction contains inputs that don't belong to this wallet",
+    assert_raises_jsonrpc(-4, "Transaction contains inputs that don't belong to this wallet",
                           rbf_node.bumpfee, rbfid)
 
 
@@ -159,7 +159,7 @@ def test_bumpfee_with_descendant_fails(rbf_node, rbf_node_address, dest_address)
     tx = rbf_node.createrawtransaction([{"txid": parent_id, "vout": 0}], {dest_address: 0.00020000})
     tx = rbf_node.signrawtransaction(tx)
     txid = rbf_node.sendrawtransaction(tx["hex"])
-    assert_raises_message(JSONRPCException, "Transaction has descendants in the wallet", rbf_node.bumpfee, parent_id)
+    assert_raises_jsonrpc(-8, "Transaction has descendants in the wallet", rbf_node.bumpfee, parent_id)
 
 
 def test_small_output_fails(rbf_node, dest_address):
@@ -174,7 +174,7 @@ def test_small_output_fails(rbf_node, dest_address):
                             Decimal("0.00100000"),
                             {dest_address: 0.00080000,
                              get_change_address(rbf_node): Decimal("0.00010000")})
-    assert_raises_message(JSONRPCException, "Change output is too small", rbf_node.bumpfee, rbfid, {"totalFee": 20001})
+    assert_raises_jsonrpc(-4, "Change output is too small", rbf_node.bumpfee, rbfid, {"totalFee": 20001})
 
 
 def test_dust_to_fee(rbf_node, dest_address):
@@ -209,7 +209,7 @@ def test_rebumping(rbf_node, dest_address):
     rbf_node.settxfee(Decimal("0.00001000"))
     rbfid = create_fund_sign_send(rbf_node, {dest_address: 0.00090000})
     bumped = rbf_node.bumpfee(rbfid, {"totalFee": 1000})
-    assert_raises_message(JSONRPCException, "already bumped", rbf_node.bumpfee, rbfid, {"totalFee": 2000})
+    assert_raises_jsonrpc(-4, "already bumped", rbf_node.bumpfee, rbfid, {"totalFee": 2000})
     rbf_node.bumpfee(bumped["txid"], {"totalFee": 2000})
 
 
@@ -217,7 +217,7 @@ def test_rebumping_not_replaceable(rbf_node, dest_address):
     # check that re-bumping a non-replaceable bump tx fails
     rbfid = create_fund_sign_send(rbf_node, {dest_address: 0.00090000})
     bumped = rbf_node.bumpfee(rbfid, {"totalFee": 10000, "replaceable": False})
-    assert_raises_message(JSONRPCException, "Transaction is not BIP 125 replaceable", rbf_node.bumpfee, bumped["txid"],
+    assert_raises_jsonrpc(-4, "Transaction is not BIP 125 replaceable", rbf_node.bumpfee, bumped["txid"],
                           {"totalFee": 20000})
 
 
@@ -268,7 +268,7 @@ def test_bumpfee_metadata(rbf_node, dest_address):
 def test_locked_wallet_fails(rbf_node, dest_address):
     rbfid = create_fund_sign_send(rbf_node, {dest_address: 0.00090000})
     rbf_node.walletlock()
-    assert_raises_message(JSONRPCException, "Please enter the wallet passphrase with walletpassphrase first.",
+    assert_raises_jsonrpc(-13, "Please enter the wallet passphrase with walletpassphrase first.",
                           rbf_node.bumpfee, rbfid)
 
 
@@ -315,9 +315,7 @@ def submit_block_with_tx(node, tx):
     block.rehash()
     block.hashMerkleRoot = block.calc_merkle_root()
     block.solve()
-    error = node.submitblock(bytes_to_hex_str(block.serialize(True)))
-    if error is not None:
-        raise Exception(error)
+    node.submitblock(bytes_to_hex_str(block.serialize(True)))
     return block