[blivet][rhel7-branch] work around older python-six

David Lehman dlehman at redhat.com
Wed Sep 3 20:31:19 UTC 2014

This is only going to be carried on rhel7-branch due to old version
of python-six in rhel7. six has MIT license, so as far as I know it
is acceptable to crib the code for add_metaclass. If I am wrong,
please let me know.

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