Agent/InterfaceManager: clear _nl_link_update when remapping a device

Resolves an issue when moving a veth device to a namespace. The device will
have _nl_link_update populated with data from generic Device creation (device
appears in the namespace). This data may cause issues for certain device
operations like setting the link up.

To avoid this, clearing the _nl_link_update while remapping the device
solves the issue.

Fixes #367

Signed-off-by: Jan Tluka <[email protected]>

lnst/Agent/InterfaceManager.py

@@ -247,6 +247,7 @@ def remap_device(self, ifindex, clsname, args=[], kwargs={}):
         except KeyError as e:
             raise DeviceConfigError("%s is a mandatory argument" % e)
         remapped_device._bulk_enabled = False
+        remapped_device._nl_link_update = {}
         remapped_device.ifindex = ifindex
         self.replace_dev(ifindex, remapped_device)
         self.rescan_devices()