virsh: Display an error when passing count <= 0 to setvcpus
The number of vCPUs for a guest must be between 1 and the maximum value configured in the domain XML. This commit introduces checks to make sure that passing count <= 0 results in an error. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1248277Signed-off-by: NLuyao Huang <lhuang@redhat.com>
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