tests: fix test failure with parrallel test

Several test cases re-use the same test class name,
which leads to test error when do parrallel test with TEST_JOBS=16,
change the test class names to unique values.

Type: fix
Signed-off-by: Tianyu Li <tianyu.li@arm.com>
Change-Id: Iefc01d40a25ebd60533baf3a2dc98a537437e8e9
diff --git a/test/test_srv6_as.py b/test/test_srv6_as.py
index eec44e3..947633e 100644
--- a/test/test_srv6_as.py
+++ b/test/test_srv6_as.py
@@ -18,21 +18,21 @@
 from util import ppp
 
 
-class TestSRv6(VppTestCase):
+class TestSRv6As(VppTestCase):
     """ SRv6 Static Proxy plugin Test Case """
 
     @classmethod
     def setUpClass(self):
-        super(TestSRv6, self).setUpClass()
+        super(TestSRv6As, self).setUpClass()
 
     @classmethod
     def tearDownClass(cls):
-        super(TestSRv6, cls).tearDownClass()
+        super(TestSRv6As, cls).tearDownClass()
 
     def setUp(self):
         """ Perform test setup before each test case.
         """
-        super(TestSRv6, self).setUp()
+        super(TestSRv6As, self).setUp()
 
         # packet sizes, inclusive L2 overhead
         self.pg_packet_sizes = [64, 512, 1518, 9018]
@@ -45,7 +45,7 @@
         """
         self.teardown_interfaces()
 
-        super(TestSRv6, self).tearDown()
+        super(TestSRv6As, self).tearDown()
 
     def configure_interface(self,
                             interface,