oeqa/eSDK: Ignore errors during directory cleanup

The cleanup can fail with:

ERROR [0.000s]: tearDownClass (eSDK.oeSDKExtSelfTest)
FileNotFoundError: [Errno 2] No such file or directory: 'bitbake.sock'

which is due to bitbake taking a small amount of time to shut down the server.
The easiest fix is just to ignore these kinds of errors, bitbake shouldn't create
any new files during shutdown.

(From OE-Core rev: 68009f4eb323e07cec8c4421d546bd3125dec033)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/eSDK.py

@@ -93,7 +93,7 @@ SSTATE_MIRRORS =  "file://.* file://%s/PATH"
 
     @classmethod
     def tearDownClass(cls):
-        shutil.rmtree(cls.tmpdir_eSDKQA)
+        shutil.rmtree(cls.tmpdir_eSDKQA, ignore_errors=True)
         super(oeSDKExtSelfTest, cls).tearDownClass()
 
     @OETestID(1602)