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

2 files changed, 2 insertions, 0 deletions

diff --git a/tools/validate-all-file.py b/tools/validate-all-file.py
index c04fb4000..67f03218a 100755
--- a/tools/validate-all-file.py
+++ b/tools/validate-all-file.py
@@ -109,5 +109,6 @@ def main():
     )
     return sum([check() for check in checks])
 
+
 if __name__ == "__main__":
     sys.exit(main())
diff --git a/tools/validate-yaml.py b/tools/validate-yaml.py
index 400a3821b..5af8668be 100755
--- a/tools/validate-yaml.py
+++ b/tools/validate-yaml.py
@@ -40,5 +40,6 @@ def main():
 
     sys.exit(res)
 
+
 if __name__ == '__main__':
     main()