assimp.py: fix AttributeError in tearDownClass

When running this test case, we will see the following error.

  AttributeError: type object 'BuildAssimp' has no attribute 'project'

assimp.py test case does not make use of SDKBuildProject, so remove
the import statement and the tearDownClass.

(From OE-Core rev: ca0a40a852abed981d54503ef2d86708471c821e)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/sdk/cases/assimp.py

@@ -1,7 +1,6 @@
 import os, subprocess, unittest
 import bb
 from oeqa.sdk.case import OESDKTestCase
-from oeqa.sdk.utils.sdkbuildproject import SDKBuildProject
 
 from oeqa.utils.subprocesstweak import errors_have_output
 errors_have_output()
@@ -62,7 +61,3 @@ class BuildAssimp(OESDKTestCase):
             self.assertEqual(machine, elf.machine())
             self.assertEqual(bits, elf.abiSize())
             self.assertEqual(endian, elf.isLittleEndian())
-
-    @classmethod
-    def tearDownClass(self):
-        self.project.clean()