[examples testing] restore code (#7099)

For some reason https://github.com/huggingface/transformers/pull/5512 re-added temp dir creation code that was removed by
https://github.com/huggingface/transformers/pull/6494 defeating the purpose of that PR for those tests.

examples/requirements.txt

@@ -15,4 +15,4 @@ pandas
 datasets
 fire
 pytest
-conllu
\ No newline at end of file
+conllu

examples/test_examples.py

@@ -80,10 +80,7 @@ class ExamplesTests(TestCasePlus):
             --warmup_steps=2
             --seed=42
             --max_seq_length=128
-            """
-        output_dir = "./tests/fixtures/tests_samples/temp_dir_{}".format(hash(testargs))
-        testargs += "--output_dir " + output_dir
-        testargs = testargs.split()
+            """.split()
 
         if is_cuda_and_apex_available():
             testargs.append("--fp16")
@@ -149,10 +146,7 @@ class ExamplesTests(TestCasePlus):
             --do_train
             --do_eval
             --num_train_epochs=1
-            """
-        output_dir = "./tests/fixtures/tests_samples/temp_dir_{}".format(hash(testargs))
-        testargs += "--output_dir " + output_dir
-        testargs = testargs.split()
+            """.split()
 
         if torch_device != "cuda":
             testargs.append("--no_cuda")