Ignore possible suffix in iproute commands.

Fix copied from
openstack/neutron@8ddeb4b

Change-Id: Ie66d291707ec4bf16c0ddefd89c1a3a5faac0299
Closes-Bug: #1561568
(cherry picked from commit 55bc7c3)

src/vnsw/opencontrail-vrouter-netns/opencontrail_vrouter_netns/linux/ip_lib.py

@@ -29,6 +29,17 @@
                          'vlan id']
 
 
+def remove_interface_suffix(interface):
+    """Remove a possible "<if>@<endpoint>" suffix from an interface' name.
+
+    This suffix can appear in some kernel versions, and intends on specifying,
+    for example, a veth's pair. However, this interface name is useless to us
+    as further 'ip' commands require that the suffix be removed.
+    """
+    # If '@' is not present, this will do nothing.
+    return interface.partition("@")[0]
+
+
 class SubProcessBase(object):
     def __init__(self, root_helper=None, namespace=None, force_root=False):
         self.root_helper = root_helper
@@ -96,6 +107,8 @@ def get_devices(self, exclude_loopback=False):
                 if exclude_loopback and name == LOOPBACK_DEVNAME:
                     continue
 
+                name = remove_interface_suffix(name)
+
                 retval.append(IPDevice(name,
                                        self.root_helper,
                                        self.namespace))