Merge #12843: [tests] Test starting bitcoind with -h and -version

63048ec73d [tests] Test starting bitcoind with -h and -version (John Newbery)

Pull request description:

  Test that starting bitcoind/bitcoin-qt with `-h` and `-version` works as expected.

  Prompted by https://github.com/bitcoin/bitcoin/pull/10762#commitcomment-28345993, which is a nullpointer dereference triggered by starting bitcoin-qt with `-h`.

  On master, this test passes when run over bitcoind, but fails when running over bitcoin-qt. I used xvfb as a virtual frame buffer to test:

  ```
  BITCOIND=/home/ubuntu/bitcoin/src/qt/bitcoin-qt xvfb-run ./feature_help.py --nocleanup
  2018-03-30T17:09:37.767000Z TestFramework (INFO): Initializing test directory /tmp/user/1000/testdi4dre13
  2018-03-30T17:09:37.767000Z TestFramework (INFO): Start bitcoin with -h for help text
  2018-03-30T17:09:37.841000Z TestFramework (ERROR): Assertion failed
  Traceback (most recent call last):
    File "/home/ubuntu/bitcoin/test/functional/test_framework/test_framework.py", line 126, in main
      self.run_test()
    File "./feature_help.py", line 25, in run_test
      assert_equal(ret_code, 0)
    File "/home/ubuntu/bitcoin/test/functional/test_framework/util.py", line 39, in assert_equal
      raise AssertionError("not(%s)" % " == ".join(str(arg) for arg in (thing1, thing2) + args))
  AssertionError: not(-11 == 0)
  2018-03-30T17:09:37.842000Z TestFramework (INFO): Stopping nodes
  Traceback (most recent call last):
    File "./feature_help.py", line 42, in <module>
      HelpTest().main()
    File "/home/ubuntu/bitcoin/test/functional/test_framework/test_framework.py", line 149, in main
      self.stop_nodes()
    File "/home/ubuntu/bitcoin/test/functional/test_framework/test_framework.py", line 273, in stop_nodes
      node.stop_node()
    File "/home/ubuntu/bitcoin/test/functional/test_framework/test_node.py", line 141, in stop_node
      self.stop()
    File "/home/ubuntu/bitcoin/test/functional/test_framework/test_node.py", line 87, in __getattr__
      assert self.rpc_connected and self.rpc is not None, "Error: no RPC connection"
  AssertionError: Error: no RPC connection
  ```

  Passes for bitcoind and bitcoin-qt when run on #12836.

  Longer term, we should consider running functional tests over bitcoin-qt in one of the Travis jobs.

Tree-SHA512: 0c2f40f3d5f0e78c3a1b07dbee8fd383eebab27ed0bf2a98a5b9cc66613dbd7b70e363c56163a37e02f68ae7ff7b3ae1769705d0e110ca68a00f8693315730a4

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