selftest/cases/runtime_test: ignore removal errors when cleaning temporary gpg directory

The high-level method tempfile.TemporaryDirectory give us no way to ignore erros on
removal thus use tempfile.mkdtemp instead. Ignoring possible issues on removal
is neccesary because it contains gpg sockets that are automatically removed by
the system once the process terminates, otherwise the following log is observed:

  File "/usr/lib/python3.5/shutil.py", line 436, in _rmtree_safe_fd
    os.unlink(name, dir_fd=topfd)
  FileNotFoundError: [Errno 2] No such file or directory: 'S.gpg-agent.browser'

This is the same fix as 7e3a7cd2426feac757def81850dc44156cd0f33e, but this applies
to runtime (instead of signing).

[YOCTO #11821]

(From OE-Core rev: f28e8131f69913ff90ed210c7a58726d3ef37db6)

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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

@@ -4,6 +4,7 @@ from oeqa.core.decorator.oeid import OETestID
 import os
 import re
 import tempfile
+import shutil
 
 class TestExport(OESelftestTestCase):
 
@@ -147,19 +148,22 @@ class TestImage(OESelftestTestCase):
         features += 'PACKAGE_CLASSES = "package_rpm"\n'
 
         # Enable package feed signing
-        self.gpg_home = tempfile.TemporaryDirectory(prefix="oeqa-feed-sign-")
+        self.gpg_home = tempfile.mkdtemp(prefix="oeqa-feed-sign-")
         signing_key_dir = os.path.join(self.testlayer_path, 'files', 'signing')
-        runCmd('gpg --batch --homedir %s --import %s' % (self.gpg_home.name, os.path.join(signing_key_dir, 'key.secret')))
+        runCmd('gpg --batch --homedir %s --import %s' % (self.gpg_home, os.path.join(signing_key_dir, 'key.secret')))
         features += 'INHERIT += "sign_package_feed"\n'
         features += 'PACKAGE_FEED_GPG_NAME = "testuser"\n'
         features += 'PACKAGE_FEED_GPG_PASSPHRASE_FILE = "%s"\n' % os.path.join(signing_key_dir, 'key.passphrase')
-        features += 'GPG_PATH = "%s"\n' % self.gpg_home.name
+        features += 'GPG_PATH = "%s"\n' % self.gpg_home
         self.write_config(features)
 
         # Build core-image-sato and testimage
         bitbake('core-image-full-cmdline socat')
         bitbake('-c testimage core-image-full-cmdline')
 
+        # remove the oeqa-feed-sign temporal directory
+        shutil.rmtree(self.gpg_home, ignore_errors=True)
+
 class Postinst(OESelftestTestCase):
     @OETestID(1540)
     def test_verify_postinst(self):