[libvirt] PATCH: allow to set nvcpus = 0

[Evgeniy Sokolov]

OpenVZ uses all CPUs available in system
- by default (number of CPUs did not set)
- number of CPUs = 0

Currenty, libvirt don't allow to set nvcpus = 0.

Attached patch removes limitation in libvirt set nvcpu = 0, but add it 
to each driver which allow to set number of virtual CPU. For OpenVZ set 
default number of CPUs = 0.
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