Merge pull request #865 from mattermost/PLT-404

PLT-404 adding basic error checking to config file.

utils/config.go

@@ -150,6 +150,10 @@ func LoadConfig(fileName string) {
 		CfgFileName = fileName
 	}
 
+	if err := config.IsValid(); err != nil {
+		panic("Error validating config file=" + fileName + ", err=" + err.Message)
+	}
+
 	configureLog(&config.LogSettings)
 	TestConnection(&config)