rpc-tests: remove python-bitcoinrpc directory

place authproxy.py at same level as other utility classes

qa/rpc-tests/rpcbind_test.py

@@ -8,7 +8,6 @@
 # Add python-bitcoinrpc to module search path:
 import os
 import sys
-sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), "python-bitcoinrpc"))
 
 import json
 import shutil