Fix regression tests

Taught bitcoind to close the HTTP connection after it gets a 'stop' command,
to make it easier for the regression tests to cleanly stop.
Move bitcoinrpc files to correct location.
Tidied up the python-based regression tests.

qa/rpc-tests/listtransactions.py

@@ -118,6 +118,7 @@ def main():
     check_json_precision()
 
     success = False
+    nodes = []
     try:
         print("Initializing test directory "+options.tmpdir)
         if not os.path.isdir(options.tmpdir):
@@ -127,6 +128,7 @@ def main():
         nodes = start_nodes(2, options.tmpdir)
         connect_nodes(nodes[1], 0)
         sync_blocks(nodes)
+
         run_test(nodes)
 
         success = True
@@ -135,12 +137,12 @@ def main():
         print("Assertion failed: "+e.message)
     except Exception as e:
         print("Unexpected exception caught during testing: "+str(e))
-        stack = traceback.extract_tb(sys.exc_info()[2])
-        print(stack[-1])
+        traceback.print_tb(sys.exc_info()[2])
 
     if not options.nocleanup:
         print("Cleaning up")
-        stop_nodes()
+        stop_nodes(nodes)
+        wait_bitcoinds()
         shutil.rmtree(options.tmpdir)
 
     if success: