The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.
Blacklist:
W503 line break before binary operator
W504 line break after binary operator
Fix:
E123 closing bracket does not match indentation of opening bracket's line
E126 continuation line over-indented for hanging indent
Change-Id: I39003496a3f4be5a4cb05cdbae53a9c097e34e14