SEBA-902 mock testing of redfish importer;
Remove hardcoded addresses and replace with config file / cmdline;
Support hostnames in importer as alternative to ip addresses;
Treat response 204 as success

Change-Id: I17e8e585e388c501c02867ce952bbe1fa9b09668
diff --git a/demo_test/config.go b/demo_test/config.go
new file mode 100644
index 0000000..e8bd589
--- /dev/null
+++ b/demo_test/config.go
@@ -0,0 +1,126 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Implements global configuration for demotest
+package main
+
+import (
+	"fmt"
+	flags "github.com/jessevdk/go-flags"
+	"gopkg.in/yaml.v2"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+)
+
+type OutputType uint8
+
+type GlobalConfigSpec struct {
+	Kafka    string `yaml:"kafka"`
+	Local    string `yaml:"local"`
+	Importer string `yaml:"importer"`
+}
+
+var (
+	CharReplacer = strings.NewReplacer("\\t", "\t", "\\n", "\n")
+
+	GlobalConfig = GlobalConfigSpec{
+		Kafka:    "kafka_ip.sh",
+		Local:    ":9999",
+		Importer: "localhost:31085",
+	}
+
+	GlobalCommandOptions = make(map[string]map[string]string)
+
+	GlobalOptions struct {
+		Config   string `short:"c" long:"config" env:"PROXYCONFIG" value-name:"FILE" default:"" description:"Location of proxy config file"`
+		Kafka    string `short:"k" long:"kafka" default:"" value-name:"SERVER:PORT" description:"IP/Host and port of Kafka"`
+		Importer string `short:"i" long:"importer" default:"" value-name:"SERVER:PORT" description:"IP/Host and port of Importer"`
+		Local    string `short:"l" long:"local" default:"" value-name:"SERVER:PORT" description:"IP/Host and port to listen on"`
+	}
+
+	Debug = log.New(os.Stdout, "DEBUG: ", 0)
+	Info  = log.New(os.Stdout, "INFO: ", 0)
+	Warn  = log.New(os.Stderr, "WARN: ", 0)
+	Error = log.New(os.Stderr, "ERROR: ", 0)
+)
+
+func ParseCommandLine() {
+	parser := flags.NewNamedParser(path.Base(os.Args[0]),
+		flags.HelpFlag|flags.PassDoubleDash|flags.PassAfterNonOption)
+	_, err := parser.AddGroup("Global Options", "", &GlobalOptions)
+	if err != nil {
+		panic(err)
+	}
+
+	_, err = parser.ParseArgs(os.Args[1:])
+	if err != nil {
+		_, ok := err.(*flags.Error)
+		if ok {
+			real := err.(*flags.Error)
+			if real.Type == flags.ErrHelp {
+				os.Stdout.WriteString(err.Error() + "\n")
+				os.Exit(0)
+			}
+		}
+
+		fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err.Error())
+
+		os.Exit(1)
+	}
+}
+
+func ProcessGlobalOptions() {
+	if len(GlobalOptions.Config) == 0 {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			Warn.Printf("Unable to discover the user's home directory: %s", err)
+			home = "~"
+		}
+		GlobalOptions.Config = filepath.Join(home, ".redfish-importer", "demotest-config")
+	}
+
+	if info, err := os.Stat(GlobalOptions.Config); err == nil && !info.IsDir() {
+		configFile, err := ioutil.ReadFile(GlobalOptions.Config)
+		if err != nil {
+			Error.Fatalf("Unable to read the configuration file '%s': %s",
+				GlobalOptions.Config, err.Error())
+		}
+		if err = yaml.Unmarshal(configFile, &GlobalConfig); err != nil {
+			Error.Fatalf("Unable to parse the configuration file '%s': %s",
+				GlobalOptions.Config, err.Error())
+		}
+	}
+
+	if GlobalOptions.Kafka != "" {
+		GlobalConfig.Kafka = GlobalOptions.Kafka
+	}
+	if GlobalOptions.Local != "" {
+		GlobalConfig.Local = GlobalOptions.Local
+	}
+	if GlobalOptions.Importer != "" {
+		GlobalConfig.Importer = GlobalOptions.Importer
+	}
+}
+
+func ShowGlobalOptions() {
+	log.Printf("Configuration:")
+	log.Printf("    Kafka: %v", GlobalConfig.Kafka)
+	log.Printf("    Listen Address: %v", GlobalConfig.Local)
+}