[qa] Increase wallet-dump RPC timeout

Increase wallet-dump RPC timeout from 30 seconds to 1 minute. This avoids a
timeout error that seemed to happen regularly (around 50% of builds) on a
particular jenkins server during the first getnewaddress RPC call made by the
test.

The failing stack trace looked like:

    Unexpected exception caught during testing: timeout('timed out',)

    File ".../bitcoin/qa/rpc-tests/test_framework/test_framework.py", line 146, in main
      self.run_test()
    File ".../bitcoin/qa/rpc-tests/wallet-dump.py", line 73, in run_test
      addr = self.nodes[0].getnewaddress()
    File ".../bitcoin/qa/rpc-tests/test_framework/coverage.py", line 49, in __call__
      return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
    File ".../bitcoin/qa/rpc-tests/test_framework/authproxy.py", line 145, in __call__
      response = self._request('POST', self.__url.path, postdata.encode('utf-8'))
    File ".../bitcoin/qa/rpc-tests/test_framework/authproxy.py", line 121, in _request
      return self._get_response()
    File ".../bitcoin/qa/rpc-tests/test_framework/authproxy.py", line 160, in _get_response
      http_response = self.__conn.getresponse()
    File "/usr/lib/python3.4/http/client.py", line 1171, in getresponse
      response.begin()
    File "/usr/lib/python3.4/http/client.py", line 351, in begin
      version, status, reason = self._read_status()
    File "/usr/lib/python3.4/http/client.py", line 313, in _read_status
      line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
    File "/usr/lib/python3.4/socket.py", line 374, in readinto
      return self._sock.recv_into(b)

Github-Pull: bitcoin#9077
Rebased-From: 8463aaa

qa/rpc-tests/test_framework/util.py

@@ -327,7 +327,7 @@ def start_node(i, dirname, extra_args=None, rpchost=None, timewait=None, binary=
 
     return proxy
 
-def start_nodes(num_nodes, dirname, extra_args=None, rpchost=None, binary=None):
+def start_nodes(num_nodes, dirname, extra_args=None, rpchost=None, timewait=None, binary=None):
     """
     Start multiple bitcoinds, return RPC connections to them
     """
@@ -336,7 +336,7 @@ def start_nodes(num_nodes, dirname, extra_args=None, rpchost=None, binary=None):
     rpcs = []
     try:
         for i in range(num_nodes):
-            rpcs.append(start_node(i, dirname, extra_args[i], rpchost, binary=binary[i]))
+            rpcs.append(start_node(i, dirname, extra_args[i], rpchost, timewait=timewait, binary=binary[i]))
     except: # If one node failed to start, stop the others
         stop_nodes(rpcs)
         raise

qa/rpc-tests/wallet-dump.py

@@ -61,7 +61,11 @@ def __init__(self):
         self.extra_args = [["-keypool=90"]]
 
     def setup_network(self, split=False):
-        self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, self.extra_args)
+        # Use 1 minute timeout because the initial getnewaddress RPC can take
+        # longer than the default 30 seconds due to an expensive
+        # CWallet::TopUpKeyPool call, and the encryptwallet RPC made later in
+        # the test often takes even longer.
+        self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, self.extra_args, timewait=60)
 
     def run_test (self):
         tmpdir = self.options.tmpdir