Revert "Support building wheels (PEP-427)"

'universal=True' means app supports py2 and py3 which isn't supported by
climate at least due to the eventlet dependency, so, my bad, it should
be reverted atm. W/o 'universal=True' wheel bdist still could be built.

This reverts commit 415a66430b3c395c8f442d89f4d4ec6d48378276

Change-Id: I074b33f1a1df87c3f3cc58b5734b6f20e364de5b