Add unit test local cpu guide and enable base testcase (#1566)

### What this PR does / why we need it?
Use Base test and cleanup all manaul patch code
- Cleanup EPLB config to avoid tmp test file
- Use BaseTest with global cache
- Add license
- Add a doc to setup unit test in local env 

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
CI passed

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

tests/ut/distributed/test_parallel_state.py

@@ -1,16 +1,31 @@
-import unittest
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
 from unittest.mock import MagicMock, patch
 
 import pytest
 from vllm.distributed.parallel_state import GroupCoordinator
 
 import vllm_ascend
+from tests.ut.base import TestBase
 from vllm_ascend.distributed.parallel_state import (
     destory_ascend_model_parallel, get_ep_group, get_etp_group,
     init_ascend_model_parallel, model_parallel_initialized)
 
 
-class TestParallelState(unittest.TestCase):
+class TestParallelState(TestBase):
 
     @patch('vllm_ascend.distributed.parallel_state._EP',
            new_callable=lambda: MagicMock(spec=GroupCoordinator))