oeqa/selftest/case: Use bb.utils.remove() instead of shutil.remove()

This avoids problems where shutil.remove will error with:

  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.extra'

when there are races over file deletion (gpg agent may be slow to exit).

We already worked around speed and race issues in bb.utils.

(From OE-Core rev: 00a8fd5b93a5c19ce0b7498e2bc653ce8ad58aaf)

(From OE-Core rev: e7c0d29e063d1a47004acdc07a63996be98c74ef)

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

meta/lib/oeqa/selftest/case.py

@@ -12,6 +12,8 @@ import oeqa.utils.ftools as ftools
 from oeqa.utils.commands import runCmd, bitbake, get_bb_var
 from oeqa.core.case import OETestCase
 
+import bb.utils
+
 class OESelftestTestCase(OETestCase):
     def __init__(self, methodName="runTest"):
         self._extra_tear_down_commands = []
@@ -167,7 +169,7 @@ to ensure accurate results.")
         if self._track_for_cleanup:
             for path in self._track_for_cleanup:
                 if os.path.isdir(path):
-                    shutil.rmtree(path)
+                    bb.utils.remove(path, recurse=True)
                 if os.path.isfile(path):
                     os.remove(path)
             self._track_for_cleanup = []