All tests fail with dbkey error

Running

`planemo test /path/to/repos/iuc/macs2/f5d67c722d67/macs2/ --galaxy_root /galaxy/production/ `

we get all tests failing with errors like

```
Exception: {u'err_data': {u'dbkey': u"An invalid option was selected for dbkey, u'hg17', please verify."},
u'traceback': u'Traceback (most recent call last):\n File "/galaxy/production/lib/galaxy/web/framework/decorators.py", line 281, in decorator\n rval = func(self, trans, *args, **kwargs)\n File "/galaxy/production/lib/galaxy/webapps/galaxy/api/tools.py", line 348, in create\n vars = tool.handle_input(trans, incoming, history=target_history)\n File "/galaxy/production/lib/galaxy/tools/__init__.py", line 1292, in handle_input\n raise exceptions.MessageException(\', \'.join(msg for msg in err_data.values()), err_data=err_data)\nMessageException: An invalid option was selected for dbkey, u\'hg17\', please verify.\n',
u'err_msg': u"An invalid option was selected for dbkey, u'hg17', please verify.",
u'err_code': 0}

...

raise KeyError("No key [%s] in [%s]" % (key, data))
KeyError: 'No key [status] in [None]'
```

I have seen this [email post from 2015](https://lists.galaxyproject.org/pipermail/galaxy-dev/2015-June/022133.html) and we found that adding dbkey='?' to a test worked. But there are a lot of tools installed and a lot of tests in each tool.

Is there somewhere I can set the key? No one really uses hg17 any more anyway?