Reported here: https://github.com/bitcoin/bitcoin/pull/10244#issuecomment-378035305

Travis log here: https://travis-ci.org/bitcoin/bitcoin/jobs/361243719#L2810

Note the JSON exception:

```
test_framework.authproxy.JSONRPCException: The mempool was not loaded yet (-1) 
```

That exception was introduced here: https://github.com/bitcoin/bitcoin/commit/cb1e319fe9e198c9c5cf5236fe9af5a3d748b9e8#diff-a0c8f511d90e83aa9b5857e819ced344R1617

cc @jtimon 
gArgs.AddArg("-server", "Accept command line and JSON-RPC commands", false, OptionsCategory::RPC);
#if HAVE_DECL_DAEMON
    gArgs.AddArg("-daemon", "Run in the background as a daemon and accept commands", false, OptionsCategory::OPTIONS);
#else
    hidden_args.emplace_back("-daemon");
#endif
    
    gArgs.AddHiddenArgs(hidden_args);
}
std::string LicenseInfo()
{
    const std::string URL_SOURCE_CODE = "<https:github.com/bitcoin/bitcoin>";
    const std::string URL_WEBSITE = "<https:bitcoincore.org>";
    return CopyrightHolders(strprintf(_("Copyright (C) %i-%i"), 2009, COPYRIGHT_YEAR) + " ") + "\n" +
           "\n" +
           strprintf(_("Please contribute if you find %s useful. "
                       "Visit %s for further information about the software."),
               PACKAGE_NAME, URL_WEBSITE) +
           "\n" +
           strprintf(_("The source code is available from %s."),
               URL_SOURCE_CODE) +
           "\n" +
           "\n" +
           _("This is experimental software.") + "\n" +
           strprintf(_("Distributed under the MIT software license, see the accompanying file %s or %s"), "COPYING", "<https:opensource.org/licenses/MIT>") + "\n" +
           "\n" +
           strprintf(_("This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit %s and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard."), "<https:www.openssl.org>") +
           "\n";
}
static void BlockNotifyCallback(bool initialSync, const CBlockIndex *pBlockIndex)