pep8 job enable and fix pep8 reported issue

use flake8 as pep8 tools
enable check and gate for pep8(voting)
Fix below flake8 issues:
    E127 continuation line over-indented for visual indent
    E211 whitespace before '('
    E222 multiple spaces after operator
    E302 expected 2 blank lines, found 1
    E501 line too long (101 > 79 characters)
    E502 the backslash is redundant between brackets
    F401 'platform' imported but unused
    W391 blank line at end of file

Change-Id: Idfb953e52c8ee35c2adefdf0e4143a381c7f49e2
Story: 2003426
Task:  24596
Signed-off-by: Sun Austin <austin.sun@intel.com>

.zuul.yaml

@@ -2,9 +2,9 @@
 - project:
     check:
       jobs:
-        - openstack-tox-pep8:
-            voting: false
         - openstack-tox-linters
+        - openstack-tox-pep8
     gate:
       jobs:
         - openstack-tox-linters
+        - openstack-tox-pep8

bsp-files/platform_comps.py

@@ -9,16 +9,17 @@ SPDX-License-Identifier: Apache-2.0
 from __future__ import print_function
 import getopt
 import os
-import platform
 import subprocess
 import sys
 import xml.etree.ElementTree as ElementTree
 
+
 def usage():
-    print("Usage: %s --groups <groups.xml> --pkgdir <pkgdir>" \
+    print("Usage: %s --groups <groups.xml> --pkgdir <pkgdir>"
           % os.path.basename(sys.argv[0]))
     exit(1)
 
+
 def add_text_tag_to_xml(parent,
                         name,
                         text):
@@ -108,18 +109,23 @@ def main():
         usage()
 
     # Get the pkglist
-    cmd = "find %s -name '*.rpm' | xargs rpm -qp --queryformat '%%{NAME}\n'" % pkgdir
+    cmd = "find %s -name '*.rpm' \
+    | xargs rpm -qp --queryformat '%%{NAME}\n'" % pkgdir
     rpmlist = subprocess.check_output(cmd, shell=True).split()
 
     tree = ElementTree.parse(groups_file)
     comps = tree.getroot()
     comps.tail = '\n'
 
-    add_group(comps, 'controller', rpmlist, filter_dir, 'filter_out_from_controller')
+    add_group(comps, 'controller', rpmlist,
-    add_group(comps, 'controller-compute', rpmlist, filter_dir, 'filter_out_from_smallsystem')
+              filter_dir, 'filter_out_from_controller')
-    add_group(comps, 'controller-compute-lowlatency', rpmlist, filter_dir, 'filter_out_from_smallsystem_lowlatency')
+    add_group(comps, 'controller-compute', rpmlist,
+              filter_dir, 'filter_out_from_smallsystem')
+    add_group(comps, 'controller-compute-lowlatency', rpmlist,
+              filter_dir, 'filter_out_from_smallsystem_lowlatency')
     add_group(comps, 'compute', rpmlist, filter_dir, 'filter_out_from_compute')
-    add_group(comps, 'compute-lowlatency', rpmlist, filter_dir, 'filter_out_from_compute_lowlatency')
+    add_group(comps, 'compute-lowlatency', rpmlist,
+              filter_dir, 'filter_out_from_compute_lowlatency')
     add_group(comps, 'storage', rpmlist, filter_dir, 'filter_out_from_storage')
 
     add_group(comps, 'controller')
@@ -134,4 +140,3 @@ def main():
 
 if __name__ == "__main__":
     main()
-

test-requirements.txt

@@ -1,3 +1,4 @@
 bashate >= 0.2
 PyYAML >= 3.1.0
 yamllint >= 0.5.2
+flake8

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = linters
+envlist = linters,pep8
 minversion = 2.3
 skipsdist = True
 
@@ -33,11 +33,15 @@ commands =
 
 [testenv:pep8]
 usedevelop = False
-skip_install = True
 deps =
-    pep8
+    flake8
+description =
+    Run style checks
 commands =
-    pep8
+    flake8
 
+[flake8]
+show-source = True
+exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,release-tag-*
 [testenv:venv]
 commands = {posargs}