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

[Sergey Galas']

1. Feature
implement offline vm migration in dispatcher thru libvirt

2. Description

libvirt based offline migration of a vm.

3. Products

Virtuozzo 7

Packages: 
  * prl-disp-service-7.0.234

4. Testing

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

5. Known issues

none

6. What was checked by developer

migration of a vm via prlctl.