clh: Make vmAddNetPutRequest capable of doing hotplugs

THe only bit needed for having the vmAddNetPutRequest() capable of
dealing with hotplugs, instead of only coldplugs, is making sure it
doesn't error out in case a `200` response is returned.

The 200 response means:
"""
The new device was successfully added to the VM instance.
"""

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

src/runtime/virtcontainers/clh.go

@@ -220,7 +220,7 @@ var vmAddNetPutRequest = func(clh *cloudHypervisor) error {
 		resp.Body.Close()
 		resp.Body = io.NopCloser(bytes.NewBuffer(respBody))
 
-		if resp.StatusCode != 204 {
+		if resp.StatusCode != 200 && resp.StatusCode != 204 {
 			clh.Logger().Errorf("vmAddNetPut failed with error '%d'. Response: %+v", resp.StatusCode, resp)
 			return fmt.Errorf("Failed to add the network device '%+v' to Cloud Hypervisor: %v", netDevice, resp.StatusCode)
 		}