fix(xen-api/_watchEvents): dont fetch events while fetching tasks

When our tasks cache is desynchronized we re-fetch all tasks.

We must wait before fetching the next events to have fetch the tasks otherwise we risk a race condition.

packages/xen-api/src/index.js

@@ -1038,7 +1038,7 @@ export class Xapi extends EventEmitter {
 
       // detect and fix disappearing tasks (e.g. when toolstack restarts)
       if (result.valid_ref_counts.task !== this._nTasks) {
-        ignoreErrors.call(
+        await ignoreErrors.call(
           this._sessionCall('task.get_all_records').then(tasks => {
             const toRemove = new Set()
             forOwn(this.objects.all, object => {