vndk-def: Code cleanup: Remove redundant code.

This commit removes redundant code from test_vndk.py.

Test: ./tests/test_vndk.py
Change-Id: Ibc59c610dcf08ae2eb296e1f3a20dfa752734bc6
diff --git a/vndk/tools/definition-tool/tests/test_vndk.py b/vndk/tools/definition-tool/tests/test_vndk.py
index 3ee2005..5344aa9 100755
--- a/vndk/tools/definition-tool/tests/test_vndk.py
+++ b/vndk/tools/definition-tool/tests/test_vndk.py
@@ -15,16 +15,15 @@
 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
 TESTDATA_DIR = os.path.join(SCRIPT_DIR ,'testdata', 'test_vndk')
 
+class MockBannedLibs(object):
+    def is_banned(self, name):
+        return False
 
 class ELFLinkerVNDKTest(unittest.TestCase):
     def _get_paths_from_nodes(self, nodes):
         return sorted([node.path for node in nodes])
 
     def test_compute_vndk(self):
-        class MockBannedLibs(object):
-            def is_banned(self, name):
-                return False
-
         input_dir = os.path.join(TESTDATA_DIR, 'pre_treble')
 
         graph = ELFLinker.create_from_dump(
@@ -44,10 +43,6 @@
         self.assertEqual([], self._get_paths_from_nodes(vndk.vndk_vnd_ext))
 
     def test_compute_vndk_fwk_ext(self):
-        class MockBannedLibs(object):
-            def is_banned(self, name):
-                return False
-
         generic_refs_dir = os.path.join(TESTDATA_DIR, 'vndk_gr')
 
         generic_refs = GenericRefs.create_from_dir(generic_refs_dir)
@@ -76,10 +71,6 @@
         self.assertEqual([], self._get_paths_from_nodes(vndk.vndk_vnd_ext))
 
     def test_compute_vndk_vnd_ext(self):
-        class MockBannedLibs(object):
-            def is_banned(self, name):
-                return False
-
         generic_refs_dir = os.path.join(TESTDATA_DIR, 'vndk_gr')
 
         generic_refs = GenericRefs.create_from_dir(generic_refs_dir)
@@ -108,10 +99,6 @@
                          self._get_paths_from_nodes(vndk.vndk_vnd_ext))
 
     def test_compute_vndk_inward_customization(self):
-        class MockBannedLibs(object):
-            def is_banned(self, name):
-                return False
-
         generic_refs_dir = os.path.join(TESTDATA_DIR, 'vndk_gr')
 
         generic_refs = GenericRefs.create_from_dir(generic_refs_dir)
@@ -161,10 +148,6 @@
         self.assertEqual([], self._get_paths_from_nodes(vndk.vndk_vnd_ext))
 
     def test_compute_vndk_indirect_ext(self):
-        class MockBannedLibs(object):
-            def is_banned(self, name):
-                return False
-
         # This test case reveals a corner case that will break vndk-indirect
         # computation.  To reproduce the case, the following condition must be
         # satisfied: