Disable io_wrapper glob test (#3270)

Disables `testListRecursivelyViaGlobbingForPathWithGlobCharacters` due to a `tf.io.gfile.glob()` breakage in tf-nightly. This should be re-enabled when this issue is fixed:
#3260

Author: psybuzz

tensorboard/backend/event_processing/io_wrapper_test.py

@@ -147,7 +147,10 @@ def testListRecursivelyViaGlobbing(self):
             expected, io_wrapper.ListRecursivelyViaGlobbing(temp_dir)
         )
 
-    def testListRecursivelyViaGlobbingForPathWithGlobCharacters(self):
+    # Temporarily disable test until tf.io.gfile.glob breaking changes in TF
+    # nightly are resolved.
+    # See https://github.com/tensorflow/tensorboard/issues/3260.
+    def skipTestListRecursivelyViaGlobbingForPathWithGlobCharacters(self):
         temp_dir = tempfile.mkdtemp(prefix=self.get_temp_dir())
         directory_names = (
             "ba*",