[Users] [TRD] libvirt based online migration of a vm

[Sergey Galas']

1. Feature
Online VM migration support in dispatcher


2. Description

libvirt based online migration of a vm.

3. Products

Virtuozzo 7

Packages: 
  * prl-disp-service-7.0.249

4. Testing

need to test online migration of a vm. i.e. the running vm disappears
from the source, appears at the target (prlctl should list it), it is
still running and its content is the same.

5. Known issues

shared disks are still not handled, nbd traffic is not tunneled via
dispatcher channel thus source should be able to connect to arbitrary
port of target.

6. What was checked by developer

migration of a vm via prlctl.