Set pep8 dependency at v1.2
Additionally, remove the pep8 dep override in tox.ini so the dep we set in tools/test-requires is actually used Change-Id: Iceb6d7a5dd8eceeebc1408e8a5edfabb48462d3e
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Additionally, remove the pep8 dep override in tox.ini so the dep we set in tools/test-requires is actually used Change-Id: Iceb6d7a5dd8eceeebc1408e8a5edfabb48462d3e