IGMP plugin

- host mode:
  igmp_listen - API to signal that the host has joined an (S,G)

- route mode:
  igmp_enable - API to enable the reception of host IGMP messages
  igmp_event - API to report the host join/leave from an (S,G)

Change-Id: Id180ec27dee617d33ab3088f5dcf6125d3aa9c8f
Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>

test/vpp_igmp.py

@@ -0,0 +1,39 @@
+
+from vpp_object import VppObject
+
+
+class IgmpSG():
+    def __init__(self, saddr, gaddr):
+        self.saddr = saddr
+        self.gaddr = gaddr
+
+
+class VppIgmpConfig(VppObject):
+    def __init__(self, test, sw_if_index, sg=None):
+        self._test = test
+        self.sw_if_index = sw_if_index
+        if isinstance(sg, list):
+            self.sg_list = sg
+        else:
+            self.sg_list = []
+            self.sg_list.append(sg)
+
+    def add_sg(self, sg):
+        self.sg.append(sg)
+
+    def add_vpp_config(self):
+        for e in self.sg_list:
+            self._test.vapi.igmp_listen(
+                1, self.sw_if_index, e.saddr, e.gaddr)
+
+    def remove_vpp_config(self):
+        self._test.vapi.igmp_clear_interface(self.sw_if_index)
+
+    def __str__(self):
+        return self.object_id()
+
+    def object_id(self):
+        return "%s:%d" % (self.sg_list, self.sw_if_index)
+
+    def query_vpp_config(self):
+        return self._test.vapi.igmp_dump()