Removed deprecation warning from 'tempest --help'

Deprecation warning of stress test runner should not show up when
running 'tempest --help'.  Warning show be shown only when
we run the stress command.

Change-Id: I6135559b6103f56542b611074ec81d29091e40b5
Closes-Bug: #1552863

tempest/cmd/run_stress.py

@@ -23,6 +23,7 @@ except ImportError:
     # unittest in python 2.6 does not contain loader, so uses unittest2
     from unittest2 import loader
 import traceback
+import warnings
 
 from cliff import command
 from oslo_log import log as logging
@@ -74,7 +75,17 @@ def discover_stress_tests(path="./", filter_attr=None, call_inherited=False):
 
 class TempestRunStress(command.Command):
 
+    @staticmethod
+    def display_deprecation_warning():
+        warnings.simplefilter('once', category=DeprecationWarning)
+        warnings.warn(
+            'Stress tests are deprecated and will be removed from Tempest '
+            'in the Newton release.',
+            DeprecationWarning)
+        warnings.resetwarnings()
+
     def get_parser(self, prog_name):
+        self.display_deprecation_warning()
         pa = super(TempestRunStress, self).get_parser(prog_name)
         pa = add_arguments(pa)
         return pa
@@ -146,6 +157,7 @@ def action(ns):
 
 
 def main():
+    TempestRunStress.display_deprecation_warning()
     parser = argparse.ArgumentParser(description='Run stress tests')
     pa = add_arguments(parser)
     ns = pa.parse_args()

tempest/stress/__init__.py

@@ -1,22 +0,0 @@
-# Copyright 2016 NEC Corporation.  All rights reserved.
-#
-# 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.
-
-import warnings
-
-warnings.simplefilter('once', category=DeprecationWarning)
-warnings.warn(
-    'Stress tests are deprecated and will be removed from Tempest '
-    'in the Newton release.',
-    DeprecationWarning)
-warnings.resetwarnings()