Export VLAN nicparam to NIC configuration scripts

The vlan nicparam is used in openvswitch mode. This patch
exports it as VLAN environment variable so that NIC
configuration scripts can later use it.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

Cherry-picked from 747ee762.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

lib/hypervisor/hv_kvm.py

@@ -1081,6 +1081,9 @@ class KVMHypervisor(hv_base.BaseHypervisor):
     if nic.nicparams[constants.NIC_LINK]:
       env["LINK"] = nic.nicparams[constants.NIC_LINK]
 
+    if nic.nicparams[constants.NIC_VLAN]:
+      env["VLAN"] = nic.nicparams[constants.NIC_VLAN]
+
     if nic.network:
       n = objects.Network.FromDict(nic.netinfo)
       env.update(n.HooksDict())

lib/hypervisor/hv_xen.py

@@ -458,6 +458,7 @@ class XenHypervisor(hv_base.BaseHypervisor):
     data.write("INTERFACE_UUID=%s\n" % nic.uuid)
     data.write("MODE=%s\n" % nic.nicparams[constants.NIC_MODE])
     data.write("LINK=%s\n" % nic.nicparams[constants.NIC_LINK])
+    data.write("VLAN=%s\n" % nic.nicparams[constants.NIC_VLAN])
 
     try:
       utils.WriteFile(cfg_file, data=data.getvalue())