After live migration Instance has been deleted, but it's DHCP lease for IP still remains on the compute node

[Tatyanka]

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "6.1"
  openstack_version: "2014.2-6.1"
  api: "1.0"
  build_number: "310"
  build_id: "2015-04-13_22-54-31"
  nailgun_sha: "d22c074dec091e5ddd8ea3003c37665058303cd5"
  python-fuelclient_sha: "9208ff4a08dcb674ce2df132399a5aa3ddfac21c"
  astute_sha: "d96a80b63198a578b2c159edbd76048819039eb0"
  fuellib_sha: "8b80657e9ceed8d59c2dff1c11e1481c7e69380e"
  ostf_sha: "c2a76a60ec4ebbd78e508216c2e12787bf25e423"
  fuelmain_sha: "335d3ed09ed79bd37e1f7a90442c4831c8845582"

OS: Ubuntu
Check VM backed with ceph migration in ha mode with 1 controller

Scenario:
1. Create cluster
2. Add 1 node with controller and ceph OSD roles
3. Add 2 node with compute and ceph OSD roles
4. Deploy the cluster
5. Check ceph status
6. Run OSTF
7. Create a new VM, assign floating ip
8. Migrate VM
9. Check cluster and server state after migration
10. Terminate VM
11. Check if dhcp lease for deleted instance is still exist on the compute

Expected:
After instance termination all it resources were cleaned as well

Actual result:

Instance has been deleted, but it's DHCP lease for IP:10.0.0.2 with MAC:fa:16:3e:18:ef:58 still remains on the compute node node-3.test.domain.local