Run flake8 against the python scripts under tools/ and devstack/tools

This patch allows flake8 to run against the scripts under tools/ and
devstack/tools directories.

It also fix the current pep8 errors where it's needed.

Change-Id: I3f447564dd528c6efdee10a4a13f1ff1d7e1c3b1

devstack/tools/ironic/scripts/configure-vm.py

@@ -1,4 +1,17 @@
 #!/usr/bin/env python
+#
+#    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 argparse
 import os.path

tools/states_to_dot.py

@@ -26,6 +26,7 @@ top_dir = os.path.abspath(os.path.join(os.path.dirname(__file__),
                                        os.pardir))
 sys.path.insert(0, top_dir)
 
+
 def print_header(text):
     print("*" * len(text))
     print(text)

tox.ini

@@ -67,7 +67,7 @@ commands = {posargs}
 
 [flake8]
 ignore = E129
-exclude =  .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,tools
+exclude =  .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build
 max-complexity=17
 
 [hacking]