Tests Cleanup: Fix missing calls to setUpClass/tearDownClass.

Continuation/Part 2 of https://gerrit.fd.io/r/#/c/17092/

Change-Id: Id0122d84eaf2c05d29e5be63a594d5e528ee7c9a
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
diff --git a/test/test_reassembly.py b/test/test_reassembly.py
index f3d983d..5fa912b 100644
--- a/test/test_reassembly.py
+++ b/test/test_reassembly.py
@@ -219,6 +219,10 @@
         cls.create_stream(cls.packet_sizes)
         cls.create_fragments()
 
+    @classmethod
+    def tearDownClass(cls):
+        super(TestIPv4Reassembly, cls).tearDownClass()
+
     def setUp(self):
         """ Test setup - force timeout on existing reassemblies """
         super(TestIPv4Reassembly, self).setUp()
@@ -549,6 +553,10 @@
         cls.create_stream(cls.packet_sizes)
         cls.create_fragments()
 
+    @classmethod
+    def tearDownClass(cls):
+        super(TestIPv6Reassembly, cls).tearDownClass()
+
     def setUp(self):
         """ Test setup - force timeout on existing reassemblies """
         super(TestIPv6Reassembly, self).setUp()
@@ -845,6 +853,10 @@
         cls.create_stream()
         cls.create_fragments()
 
+    @classmethod
+    def tearDownClass(cls):
+        super(TestIPv4ReassemblyLocalNode, cls).tearDownClass()
+
     def setUp(self):
         """ Test setup - force timeout on existing reassemblies """
         super(TestIPv4ReassemblyLocalNode, self).setUp()
@@ -964,6 +976,10 @@
         cls.packet_sizes = [64, 512, 1518, 9018]
         cls.padding = " abcdefghijklmn"
 
+    @classmethod
+    def tearDownClass(cls):
+        super(TestFIFReassembly, cls).tearDownClass()
+
     def setUp(self):
         """ Test setup - force timeout on existing reassemblies """
         super(TestFIFReassembly, self).setUp()