Cleanup unit test support code (RIPD-1380):

* Remove `src/test/support/mao`
* Flatten `src/test/support/jtx` to `src/test/jtx`

src/test/jtx/impl/JSONRPCClient.cpp

@@ -0,0 +1,163 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2016 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+#include <BeastConfig.h>
+#include <test/jtx/JSONRPCClient.h>
+#include <ripple/json/json_reader.h>
+#include <ripple/json/to_string.h>
+#include <ripple/protocol/JsonFields.h>
+#include <ripple/server/Port.h>
+#include <beast/http/message.hpp>
+#include <beast/http/streambuf_body.hpp>
+#include <beast/http/string_body.hpp>
+#include <beast/http/read.hpp>
+#include <beast/http/write.hpp>
+#include <boost/asio.hpp>
+#include <string>
+
+namespace ripple {
+namespace test {
+
+class JSONRPCClient : public AbstractClient
+{
+    static
+    boost::asio::ip::tcp::endpoint
+    getEndpoint(BasicConfig const& cfg)
+    {
+        auto& log = std::cerr;
+        ParsedPort common;
+        parse_Port (common, cfg["server"], log);
+        for (auto const& name : cfg.section("server").values())
+        {
+            if (! cfg.exists(name))
+                continue;
+            ParsedPort pp;
+            parse_Port(pp, cfg[name], log);
+            if(pp.protocol.count("http") == 0)
+                continue;
+            using boost::asio::ip::address_v4;
+            if(*pp.ip == address_v4{0x00000000})
+                *pp.ip = address_v4{0x7f000001};
+            return { *pp.ip, *pp.port };
+        }
+        Throw<std::runtime_error>("Missing HTTP port");
+        return {}; // Silence compiler control paths return value warning
+    }
+
+    template <class ConstBufferSequence>
+    static
+    std::string
+    buffer_string (ConstBufferSequence const& b)
+    {
+        using namespace boost::asio;
+        std::string s;
+        s.resize(buffer_size(b));
+        buffer_copy(buffer(&s[0], s.size()), b);
+        return s;
+    }
+
+    boost::asio::ip::tcp::endpoint ep_;
+    boost::asio::io_service ios_;
+    boost::asio::ip::tcp::socket stream_;
+    beast::streambuf bin_;
+    beast::streambuf bout_;
+    unsigned rpc_version_;
+
+public:
+    explicit
+    JSONRPCClient(Config const& cfg, unsigned rpc_version)
+        : ep_(getEndpoint(cfg))
+        , stream_(ios_)
+        , rpc_version_(rpc_version)
+    {   
+        stream_.connect(ep_);
+    }
+
+    ~JSONRPCClient() override
+    {
+        //stream_.shutdown(boost::asio::ip::tcp::socket::shutdown_both);
+        //stream_.close();
+    }
+
+    /*
+        Return value is an Object type with up to three keys:
+            status
+            error
+            result
+    */
+    Json::Value
+    invoke(std::string const& cmd,
+        Json::Value const& params) override
+    {
+        using namespace beast::http;
+        using namespace boost::asio;
+        using namespace std::string_literals;
+
+        request<string_body> req;
+        req.method = "POST";
+        req.url = "/";
+        req.version = 11;
+        req.fields.insert("Content-Type", "application/json; charset=UTF-8");
+        req.fields.insert("Host",
+            ep_.address().to_string() + ":" + std::to_string(ep_.port()));
+        {
+            Json::Value jr;
+            jr[jss::method] = cmd;
+            if (rpc_version_ == 2)
+            {
+                jr[jss::jsonrpc] = "2.0";
+                jr[jss::ripplerpc] = "2.0";
+                jr[jss::id] = 5;
+            }
+            if(params)
+            {
+                Json::Value& ja = jr[jss::params] = Json::arrayValue;
+                ja.append(params);
+            }
+            req.body = to_string(jr);
+        }
+        prepare(req);
+        write(stream_, req);
+
+        response<streambuf_body> res;
+        read(stream_, bin_, res);
+
+        Json::Reader jr;
+        Json::Value jv;
+        jr.parse(buffer_string(res.body.data()), jv);
+        if(jv["result"].isMember("error"))
+            jv["error"] = jv["result"]["error"];
+        if(jv["result"].isMember("status"))
+            jv["status"] = jv["result"]["status"];
+        return jv;
+    }
+
+    unsigned version() const override
+    {
+        return rpc_version_;
+    }
+};
+
+std::unique_ptr<AbstractClient>
+makeJSONRPCClient(Config const& cfg, unsigned rpc_version)
+{
+    return std::make_unique<JSONRPCClient>(cfg, rpc_version);
+}
+
+} // test
+} // ripple