New sleep task to Notification server
There is issue regarding sleeps during the client jobs. I have tried different kind of sleeps during deployments, but mostly those will fail if they are more than 1 minute long. For some reason Agent fails during the sleep as it cannot get any feedback from it. Sleeps are needed in different scenarios and one were we have try to use it is to allow Agent plugins installations during the sleep time as there is not any own task type for that either. Sleep task could be initiate in the client or in notification server side as it only needs to wait before launching the new job.