Update hacking for Python3

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

Fix problems found.

Remove hacking and friends from lower-constraints, they are not needed
for installation.

Change-Id: If75153300f07e6d1c5bf433af35a0dd4d98e6c7f

1 files changed, 2 insertions, 0 deletions

diff --git a/benchmark/benchmark.py b/benchmark/benchmark.py
index 2009eda..6788373 100644
--- a/benchmark/benchmark.py
+++ b/benchmark/benchmark.py
@@ -63,6 +63,7 @@ def run_one(runner, cmd):
         assert code == 0, "Command failed"
     return __inner
 
+
 runners = [
     ("{0}", run_plain),
     ("sudo {0}", run_sudo),
@@ -109,5 +110,6 @@ def main():
     atexit.register(run_sudo, ["ip", "netns", "delete", "bench_ns"])
     run_bench('ip netns exec bench_ns ip a'.split(), runners[1:])
 
+
 if __name__ == "__main__":
     main()