lbaas launch issue is fixed.

(id: <index>) will be added in the netns name
once the interface is added to the netns by redhat 7.2.
exists() is modified not to check for the exact match

Change-Id: I3b95878c3228639f3ce5c0220604ce016a2e754b
Closes-bug: 1587711

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

@@ -512,7 +512,7 @@ def exists(self, name):
         output = self._parent._execute('o', 'netns', ['list'])
 
         for line in output.split('\n'):
-            if name == line.strip():
+            if name in line.strip():
                 return True
         return False