Cleaning up mesos (hanging tasks)

I tried to do away the task with 
```
KILL Request (JSON):
POST /api/v1/scheduler  HTTP/1.1

Host: masterhost:5050
Content-Type: application/json
Mesos-Stream-Id: 130ae4e3-6b13-4ef4-baa9-9f2e85c3e9af

{
  "framework_id"    : {"value" : "12220-3440-12532-2345"},
  "type"            : "KILL",
  "kill"            : {
    "task_id"   :  {"value" : "12220-3440-12532-my-task"},
    "agent_id"  :  {"value" : "12220-3440-12532-S1233"}
  }
}

KILL Response:
HTTP/1.1 202 Accepted
```

But to no avail. So taking the matters in my own hands.

* Stop all salves;
* Clean slaves data ```rm -rf /var/lib/mesos/*``` on each of the slave
* Stop master;
* Clean master data ```rm -rf /var/lib/mesos/* ```* 
* Stop marathon
* Clear zookeeper entries for marathon and mesos
```
echo rmr /marathon | /opt/mesosphere/zookeeper/bin/zkCli.sh
echo rmr /mesos    | /opt/mesosphere/zookeeper/bin/zkCli.sh
```
* Bring marathon, mesos master and all slaves up.