Use safe host / channel default

Use nonexistent irc server and empty channel list as default config
options to avoid unwanted surprises when testing the bot.

Addresses https://github.com/google/alertmanager-irc-relay/issues/5

Signed-off-by: Luca Bigliardi <shammash@google.com>

config.go

@@ -52,11 +52,11 @@ func LoadConfig(configFile string) (*Config, error) {
 		IRCNick:      "alertmanager-irc-relay",
 		IRCNickPass:  "",
 		IRCRealName:  "Alertmanager IRC Relay",
-		IRCHost:      "irc.freenode.net",
+		IRCHost:      "example.com",
 		IRCPort:      7000,
 		IRCUseSSL:    true,
 		IRCVerifySSL: true,
-		IRCChannels:  []IRCChannel{IRCChannel{Name: "#airtest"}},
+		IRCChannels:  []IRCChannel{},
 		MsgOnce:      false,
 		UsePrivmsg:   false,
 	}

irc.go

@@ -215,7 +215,7 @@ func (notifier *IRCNotifier) Run() {
 	keepGoing := true
 	for keepGoing {
 		if !notifier.Client.Connected() {
-			log.Printf("Connecting to IRC")
+			log.Printf("Connecting to IRC %s", notifier.Client.Config().Server)
 			notifier.BackoffCounter.Delay()
 			if err := notifier.Client.Connect(); err != nil {
 				log.Printf("Could not connect to IRC: %s", err)