vmx: write cpuid.coresPerSocket back from CPU topology
    
    When writing the VMX file from the domain XML, write
    cpuid.coresPerSocket if there is a specified CPU topology in the guest.
    
    Use the domain XML of esx-in-the-wild-9 in vmx2xml as testcase for
    xml2vmxtest.
    
    Signed-off-by: Pino Toscano <ptoscano@redhat.com>
    Acked-by: Richard W.M. Jones <rjones@redhat.com>
    Reviewed-by: Ján Tomko <jtomko@redhat.com>
    Signed-off-by: Ján Tomko <jtomko@redhat.com>