message: Add sync_blocks in wallet_orphanedreward.py.
  Add an explicit sync_blocks call in wallet_orphanedreward.py, which was
  missing and could lead to intermittent failures of the test due to
  race conditions.
  This will presumably fix
diff: @@ -31,6 +31,7 @@ class OrphanedBlockRewardTest(BitcoinTestFramework):
  # Let the block reward mature and send coins including both
  # the existing balance and the block reward.
  self.nodes[0].generate(150)
  + self.sync_blocks()
  assert_equal(self.nodes[1].getbalance(), 10 + 25)
  txid = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 30)
  