qa: port 12 wallet/mining tests to python3 and fix three framework blockers

Ports qa/rpc-tests from 6 python3 files to 18. Ran every ported test against
the freshly built v1.3.0 dragonxd. Results, honestly:

  PASS (1)            getblocktemplate_proposals.py
  NOT APPLICABLE (7)  wallet.py, walletbackup.py, wallet_protectcoinbase.py,
                      wallet_listnotes.py, wallet_mergetoaddress.py,
                      getblocktemplate.py, wallet_shieldcoinbase.py
  BLOCKED (4)         wallet_sapling, wallet_nullifiers, wallet_persistence,
                      wallet_treestate

The "not applicable" seven are inherited Zcash/Hush-era tests that exercise
features DragonX deliberately removed. They assume transparent t->t value
transfer, but ASSETCHAINS_PRIVATE=1 (hush_utils.h:1826) makes sendtoaddress
and sendmany consensus-refuse; they assume Sprout joinsplits, which are gone
from the RPC layer entirely; and they hardcode Bitcoin economics (10 coin/block,
100-block maturity) against DragonX's 3 DRGX and COINBASE_MATURITY=1. They are
ported and left in place rather than deleted, but they cannot pass on this chain
without being rewritten around z_shieldcoinbase/autoshield.

Three framework fixes in test_framework/util.py, each of which broke every
multi-node test:
  - initialize_chain() passed -connect=0, and init.cpp soft-sets -listen=0 when
    -connect is present, so cache node0 never opened its p2p port and nodes 1-3
    could never sync to it -- initialize_chain() hung forever in sync_blocks().
    Now passes -listen=1 -bind=127.0.0.1 -dnsseed=0 explicitly (an explicit arg
    beats SoftSetBoolArg) while keeping the cache nodes off the public network.
  - cache cleanup removed files from <datadir> when dragonxd writes them one
    level deeper into the net-specific <datadir>/regtest.
  - set_node_times() did print("..." + t) with t an int -> TypeError.
  - default binary paths corrected to src/dragonxd and src/dragonx-cli.

The four BLOCKED tests are blocked by a daemon assert, not by the port; see the
follow-up commit/report on BLOCK_VALID_CONTEXT.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FU87LdsJZiZkfq1eXubpeo

qa/rpc-tests/test_framework/util.py

@@ -148,14 +148,20 @@ def initialize_chain(test_dir):
             # Same two requirements as start_node(): -regtest must be a command-line flag (the
             # conf key is ignored, and without it this cache node runs on MAINNET), and -asmap
             # must be absolute or dragonxd refuses to start.
-            args = [ os.getenv("BITCOIND", "dragonxd"), "-regtest", "-connect=0", "-keypool=1", "-datadir="+datadir, "-discover=0" ]
+            # -connect=<anything> makes init.cpp soft-set -listen=0 ("parameter interaction: -connect
+            # set -> setting -listen=0"), so cache node0 never opened its p2p port and nodes 1-3 could
+            # never sync to it -- initialize_chain() then hung forever in sync_blocks(). Pass -listen
+            # and -bind explicitly (an explicit arg beats SoftSetBoolArg) and keep the loopback bind so
+            # the cache nodes stay off the public network.
+            args = [ os.getenv("BITCOIND", "src/dragonxd"), "-regtest", "-connect=0", "-keypool=1", "-datadir="+datadir, "-discover=0",
+                     "-listen=1", "-bind=127.0.0.1", "-dnsseed=0" ]
             _am = os.path.join(os.path.dirname(os.path.abspath(__file__)), "../../../asmap.dat")
             if os.path.exists(_am):
                 args.append("-asmap=" + os.path.realpath(_am))
             if i > 0:
                 args.append("-connect=127.0.0.1:"+str(p2p_port(0)))
             bitcoind_processes[i] = subprocess.Popen(args)
-            cmd      = os.getenv("BITCOINCLI", "dragonx-cli")
+            cmd      = os.getenv("BITCOINCLI", "src/dragonx-cli")
             cmd_args = cmd + " -datadir="+datadir + " -rpcwait getblockcount"
             if os.getenv("PYTHON_DEBUG", ""):
                 print("initialize_chain: hushd started, calling: " + cmd_args)
@@ -198,10 +204,17 @@ def initialize_chain(test_dir):
         wait_bitcoinds()
         for i in range(4):
             print("Cleaning up cache dir files")
-            os.remove(log_filename("cache", i, "debug.log"))
-            os.remove(log_filename("cache", i, "db.log"))
-            os.remove(log_filename("cache", i, "peers.dat"))
-            os.remove(log_filename("cache", i, "fee_estimates.dat"))
+            # log_filename() points at <cache>/node<i>/regtest, but that IS the -datadir we passed;
+            # dragonxd writes its logs/peers.dat one level deeper, into the net-specific
+            # <datadir>/regtest subdir (same datadir-vs-netdir split that forced -asmap to be
+            # absolute in start_node). Try both, and tolerate files a node never created.
+            for name in ("debug.log", "db.log", "peers.dat", "fee_estimates.dat"):
+                for cand in (log_filename("cache", i, os.path.join("regtest", name)),
+                             log_filename("cache", i, name)):
+                    try:
+                        os.remove(cand)
+                    except OSError:
+                        pass
 
     for i in range(4):
         from_dir = os.path.join("cache", "node"+str(i))
@@ -352,7 +365,7 @@ def stop_nodes(nodes):
     del nodes[:] # Emptying array closes connections as a side effect
 
 def set_node_times(nodes, t):
-    print("Setting nodes time to " + t)
+    print("Setting nodes time to " + str(t))
     for node in nodes:
         node.setmocktime(t)