#2864 Adapting application to work in address without name as ROOT:

[Limraj]

• fixed url websocket (getAppLocation) and report data; (ReportsData.vue)
• moved function for websocket to common.js;
• added common.js to scadalts-ui vue project;
• added property: websocket.client.sockjs.url in env.properties; (added SystemSettingsUtils.getWebsocketClientSockjsUrl())
• deprecated EventManager.notifyWebSocketSubscribers, AlarmLevelMessage.getAlarmlevel
• change name from AlarmLevelMessage to WsAlarmLevelMessage;
• use setClientLibraryUrl in websocket config endpoints;
• corrected spring-security.xml for websocket api and /api/alarms/history/, /api/alarms/live/;
• use websocket in EventList.vue, DataPointEventList.vue, PointWatcher/index.vue;
• async-supported = true for Log4jServletFilter;
• fixed MessagingDataSourceRT.java;
• clearProject: scadalts-ui/dist, WebContent/resources/js-ui, WebContent/img