KVM: Remove boot restriction for paravirtual nics

Newer virtio can boot from the network perfectly well, so there's no
point in keeping this restriction in place. This will still fail on
older kernels.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

lib/hypervisor/hv_kvm.py

@@ -786,15 +786,10 @@ class KVMHypervisor(hv_base.BaseHypervisor):
                                     constants.HV_VNC_X509_VERIFY))
 
     boot_order = hvparams[constants.HV_BOOT_ORDER]
-
     if (boot_order == constants.HT_BO_CDROM and
         not hvparams[constants.HV_CDROM_IMAGE_PATH]):
       raise errors.HypervisorError("Cannot boot from cdrom without an"
                                    " ISO path")
-    if (boot_order == constants.HT_BO_NETWORK and
-        hvparams[constants.HV_NIC_TYPE] == constants.HT_NIC_PARAVIRTUAL):
-      raise errors.HypervisorError("Cannot boot from a paravirtual NIC. Please"
-                                   " change the NIC type.")
 
   @classmethod
   def PowercycleNode(cls):