Make class members journal const

src/ripple/net/HTTPClientSSLContext.h

@@ -182,7 +182,7 @@ public:
 
 private:
     boost::asio::ssl::context ssl_context_;
-    beast::Journal j_;
+    beast::Journal const j_;
     const bool verify_;
 };
 

src/ripple/net/SSLHTTPDownloader.h

@@ -67,7 +67,7 @@ private:
     boost::optional<
         boost::asio::ssl::stream<boost::asio::ip::tcp::socket>> stream_;
     boost::beast::flat_buffer read_buf_;
-    beast::Journal j_;
+    beast::Journal const j_;
 
     void
     do_session(

src/ripple/net/impl/RPCCall.cpp

@@ -92,7 +92,7 @@ std::string createHTTPPost (
 class RPCParser
 {
 private:
-    beast::Journal j_;
+    beast::Journal const j_;
 
     // TODO New routine for parsing ledger parameters, other routines should standardize on this.
     static bool jvParseLedger (Json::Value& jvRequest, std::string const& strLedger)

src/ripple/net/impl/RPCSub.cpp

@@ -194,7 +194,7 @@ private:
 
     std::deque<std::pair<int, Json::Value> >    mDeque;
 
-    beast::Journal j_;
+    beast::Journal const j_;
     Logs& logs_;
 };