message: Fix for header spam test
diff: @@ -161,13 +161,14 @@ class QtumHeaderSpamTest(BitcoinTestFramework):
  def dos_protection_triggered_via_spam_on_variable_height_test(self):
  self.start_p2p_connection()
  - for i in range(1504):
  + for i in range(2055):
  block_header = self._create_pos_header(self.node, self.staking_prevouts, self.node.getblockhash(self.node.getblockcount()-500+(i%500)))
  block_header.rehash()
  msg = msg_headers()
  block_header.nNonce = i
  msg.headers.extend([block_header])
  self.p2p_node.send_message(msg)
  +
  self.p2p_node.wait_for_disconnect(timeout=5)
  