Export the packages anvil requires.

Export and ensure that we don't remove the
dependencies that anvil and openstack source
directories requires to operate.

- d2to1 is required to even run setup.py
- setuptools-git (the same)
- pbr (the same)

Fixes bug: #1189707

Change-Id: I099856eba07784afa2b65c3e4ebf6c0abcaab4bd
Merge "Export the packages anvil requires."