Doug Hellmann ddc3839bdc Enable optional Python 3 support
Add USE_PYTHON3 and PYTHON3_VERSION variables to allow services to use
python 3 if they indicate support in their python package metadata.

Tested in Heat here -> I837c2fba682ab430d50e9f43913f2fed20325a7a.
Project config change to add a dedicated job to Heat is here -> I0837e62d6ccc66397a5e409f0961edd4be31f467

Change-Id: I079e18b58b214bf8362945c253d6d894ca8b1a6b
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