tests: refactor vpp_object.py

Move __str__ to super for all subclasses of VppObject
Implement __repr__ in VppObject
Implement __hash__ and __eq__

Change-Id: Ibd4ea37b84b17f499ab86630fb5b9ed9c8b4b1c2
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>

test/vpp_l2.py

@@ -93,9 +93,6 @@ class VppBridgeDomain(VppObject):
     def query_vpp_config(self):
         return find_bridge_domain(self._test, self.bd_id)
 
-    def __str__(self):
-        return self.object_id()
-
     def object_id(self):
         return "bridge-domain-%d" % (self.bd_id)
 
@@ -125,9 +122,6 @@ class VppBridgeDomainPort(VppObject):
                                        self.bd.bd_id,
                                        self.itf.sw_if_index)
 
-    def __str__(self):
-        return self.object_id()
-
     def object_id(self):
         return "BD-Port-%s-%s" % (self.bd, self.itf)
 
@@ -157,9 +151,6 @@ class VppBridgeDomainArpEntry(VppObject):
                                             self.mac.packed,
                                             self.ip.address)
 
-    def __str__(self):
-        return self.object_id()
-
     def object_id(self):
         return "BD-Arp-Entry-%s-%s-%s" % (self.bd, self.mac, self.ip.address)
 
@@ -203,9 +194,6 @@ class VppL2FibEntry(VppObject):
                                  self.mac.packed,
                                  self.itf.sw_if_index)
 
-    def __str__(self):
-        return self.object_id()
-
     def object_id(self):
         return "L2-Fib-Entry-%s-%s-%s" % (self.bd, self.mac, self.itf)
 
@@ -232,8 +220,5 @@ class VppL2Vtr(VppObject):
             return (d.vtr_op == self.op)
         return False
 
-    def __str__(self):
-        return self.object_id()
-
     def object_id(self):
         return "L2-vtr-%s-%d" % (str(self.itf), self.op)