Update hacking for Python3

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

Fix problems found by updated hacking version.

Update local hacking checks for new flake8.

Remove hacking and friends from lower-constraints, they are not
needed in installations.

Change-Id: I67e5ca24c550163c218fb06692de0b7c528d8318

kolla/hacking/checks.py

@@ -12,6 +12,7 @@
 
 import re
 
+from hacking import core
 
 mutable_default_args = re.compile(r"^\s*def .+\((.+=\{\}|.+=\[\])")
 
@@ -22,12 +23,13 @@ UNDERSCORE_IMPORT_FILES = []
 string_translation = re.compile(r"[^_]*_\(\s*('|\")")
 translated_log = re.compile(
     r"(.)*LOG\.(audit|error|info|warn|warning|critical|exception)"
-    "\(\s*_\(\s*('|\")")
+    r"\(\s*_\(\s*('|\")")
 underscore_import_check = re.compile(r"(.)*import _(.)*")
 # We need this for cases where they have created their own _ function.
 custom_underscore_check = re.compile(r"(.)*_\s*=\s*(.)*")
 
 
+@core.flake8ext
 def check_explicit_underscore_import(logical_line, filename):
     """Check for explicit import of the _ function
 
@@ -50,6 +52,7 @@ def check_explicit_underscore_import(logical_line, filename):
         yield(0, "D703: Found use of _() without explicit import of _!")
 
 
+@core.flake8ext
 def no_log_warn(logical_line):
     """Disallow 'LOG.warn('
 
@@ -63,13 +66,8 @@ def no_log_warn(logical_line):
         yield (0, msg)
 
 
+@core.flake8ext
 def no_mutable_default_args(logical_line):
     msg = "K301: Method's default argument shouldn't be mutable!"
     if mutable_default_args.match(logical_line):
         yield (0, msg)
-
-
-def factory(register):
-    register(check_explicit_underscore_import)
-    register(no_mutable_default_args)
-    register(no_log_warn)

lower-constraints.txt

@@ -20,12 +20,10 @@ docker==2.4.2
 dogpile.cache==0.6.5
 extras==1.0.0
 fixtures==3.0.0
-flake8==2.5.5
 gitdb2==2.0.3
 gitdb==0.6.4
 GitPython==1.0.1
 graphviz==0.4
-hacking==1.1.0
 idna==2.6
 iso8601==0.1.12
 Jinja2==2.8
@@ -59,7 +57,6 @@ packaging==17.1
 pbr==2.0.0
 prettytable==0.7.1
 pycparser==2.18
-pyflakes==0.8.1
 pyinotify==0.9.6
 pyOpenSSL==17.5.0
 pyparsing==2.2.0

test-requirements.txt

@@ -8,11 +8,10 @@ coverage!=4.4,>=4.0 # Apache-2.0
 ddt>=1.0.1 # MIT
 extras>=1.0.0 # MIT
 graphviz!=0.5.0,>=0.4 # MIT License
-hacking>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 PrettyTable<0.8,>=0.7.1 # BSD
-pyflakes>=1.4.0,<1.5
 PyYAML>=3.10 # MIT
 python-barbicanclient>=4.0.0 # Apache-2.0
 python-heatclient>=1.10.0 # Apache-2.0

tests/test_set_config.py

@@ -66,6 +66,7 @@ class LoadFromEnv(base.BaseTestCase):
                                   mock.call().__exit__(None, None, None)],
                                  mo.mock_calls)
 
+
 FAKE_CONFIG_FILES = [
     set_configs.ConfigFile(
         '/var/lib/kolla/config_files/bar.conf',

tools/validate-all-file.py

@@ -109,5 +109,6 @@ def main():
     )
     return sum([check() for check in checks])
 
+
 if __name__ == "__main__":
     sys.exit(main())

tools/validate-yaml.py

@@ -40,5 +40,6 @@ def main():
 
     sys.exit(res)
 
+
 if __name__ == '__main__':
     main()

tox.ini

@@ -192,8 +192,12 @@ show-source = True
 enable-extensions = H203,H106
 exclude=.eggs,.git,.tox,doc
 
-[hacking]
-local-check-factory = kolla.hacking.checks.factory
+[flake8:local-plugins]
+extension =
+    D703 = checks:check_explicit_underscore_import
+    K301 = checks:no_mutable_default_args
+    K302 = checks:no_log_warn
+paths = ./kolla/hacking
 
 [testenv:lower-constraints]
 deps =