selftests/check_tmp_dirs: Remove unused import

Signed-off-by: NLucas Meneghel Rodrigues <lookkas@gmail.com>

selftests/check_tmp_dirs

@@ -11,8 +11,6 @@ if os.path.isdir(os.path.join(basedir, 'avocado')):
     os.environ['PATH'] += ":" + os.path.join(basedir, 'libexec')
     sys.path.append(basedir)
 
-from avocado.core import data_dir
-
 
 def check_tmp_dirs():
     dirs_to_check = [tempfile.gettempdir()]