core: use PlaybookStatus to determie playbook has ended

Instead of parsing the current event we can reuse the same logic as used
for async playbooks, check the "status" artifact to see if ansible is
stil running or not, and check if all events has been processed

backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/common/utils/ansible/AnsibleRunnerClient.java

@@ -53,19 +53,10 @@ public AnsibleRunnerClient() {
     }
 
     public Boolean playHasEnded(String uuid, int lastEventId) {
-        String lastEvent = getEventFileName(uuid, lastEventId);
-        if (lastEvent == null) {
-            return false;
-        }
-        String jobEvents = getJobEventsDir(uuid);
-        File lastEventFile = new File(jobEvents + lastEvent);
-        String res = "";
-        try {
-                res = Files.readString(lastEventFile.toPath());
-            } catch (IOException e) {
-                return false;
-            }
-        return res.contains("playbook_on_stats");
+        // get current status, but new events might have appeared since last processing
+        PlaybookStatus currentPlaybookStatus = getPlaybookStatus(uuid);
+        String msg = currentPlaybookStatus.getMsg();
+        return !msg.equalsIgnoreCase("running") && lastEventId <= getTotalEvents(uuid);
     }
 
     public AnsibleReturnValue artifactHandler(UUID uuid, int lastEventID, int timeout, BiConsumer<String, String> fn)