test: ip6 vrf instances multi-context test (CSIT-497)

- add/delete IPv6 VRF instances and verify results by parsing output
  of ip6_fib_dump API command and by traffic

- small changes in assert_nothing_captured and get_capture to get logged
  unexpected packets

Change-Id: I32207447be2df942e335aa9890ff52fb88e46597
Signed-off-by: Jan Gelety <jgelety@cisco.com>

test/vpp_interface.py

@@ -226,12 +226,16 @@ class VppInterface(object):
             self.has_ip6_config = False
         self.has_ip6_config = False
 
-    def configure_ipv6_neighbors(self):
-        """For every remote host assign neighbor's MAC to IPv6 address."""
+    def configure_ipv6_neighbors(self, vrf_id=0):
+        """For every remote host assign neighbor's MAC to IPv6 addresses.
+
+        :param vrf_id: The FIB table / VRF ID. (Default value = 0)
+        """
         for host in self._remote_hosts:
             macn = host.mac.replace(":", "").decode('hex')
+            ipn = host.ip6n
             self.test.vapi.ip_neighbor_add_del(
-                self.sw_if_index, macn, host.ip6n, is_ipv6=1)
+                self.sw_if_index, macn, ipn, vrf_id, is_ipv6=1)
 
     def unconfig(self):
         """Unconfigure IPv6 and IPv4 address on the VPP interface."""

test/vpp_papi_provider.py

@@ -251,9 +251,10 @@ class VppPapiProvider(object):
                         {'sw_if_index': sw_if_index,
                          'enable': is_enable})
 
-    def sw_interface_ra_suppress(self, sw_if_index):
+    def sw_interface_ra_suppress(self, sw_if_index, suppress=1):
         return self.api(self.papi.sw_interface_ip6nd_ra_config,
-                        {'sw_if_index': sw_if_index})
+                        {'sw_if_index': sw_if_index,
+                         'suppress': suppress})
 
     def ip6_sw_interface_ra_config(self, sw_if_index,
                                    no,
@@ -601,6 +602,9 @@ class VppPapiProvider(object):
     def ip_fib_dump(self):
         return self.api(self.papi.ip_fib_dump, {})
 
+    def ip6_fib_dump(self):
+        return self.api(self.papi.ip6_fib_dump, {})
+
     def ip_neighbor_add_del(self,
                             sw_if_index,
                             mac_address,

test/vpp_pg_interface.py

@@ -220,6 +220,10 @@ class VppPGInterface(VppInterface):
                 if len(capture.res) == expected_count:
                     # bingo, got the packets we expected
                     return capture
+                elif len(capture.res) > expected_count:
+                    self.test.logger.error(
+                        ppc("Unexpected packets captured:", capture))
+                    break
                 else:
                     self.test.logger.debug("Partial capture containing %s "
                                            "packets doesn't match expected "
@@ -251,8 +255,6 @@ class VppPGInterface(VppInterface):
                 if not capture or len(capture.res) == 0:
                     # junk filtered out, we're good
                     return
-                self.test.logger.error(
-                    ppc("Unexpected packets captured:", capture))
             except:
                 pass
             self.generate_debug_aid("empty-assert")