(cobra) add IXCobraConfig struct to pass cobra config around

ws/ws_cobra_to_statsd.cpp

@@ -109,10 +109,7 @@ namespace ix
         return val.asString();
     }
 
-    int ws_cobra_to_statsd_main(const std::string& appkey,
-                                const std::string& endpoint,
-                                const std::string& rolename,
-                                const std::string& rolesecret,
+    int ws_cobra_to_statsd_main(const ix::CobraConfig& config,
                                 const std::string& channel,
                                 const std::string& filter,
                                 const std::string& host,
@@ -123,10 +120,10 @@ namespace ix
                                 const ix::SocketTLSOptions& tlsOptions)
     {
         ix::CobraConnection conn;
-        conn.configure(appkey,
-                       endpoint,
-                       rolename,
-                       rolesecret,
+        conn.configure(config.appkey,
+                       config.endpoint,
+                       config.rolename,
+                       config.rolesecret,
                        ix::WebSocketPerMessageDeflateOptions(true),
                        tlsOptions);
         conn.connect();