It seems I added this --force with the original commit
(I4943ae723b06b0ad808e7c7f20788109e21aa8bf) but I'm not really sure
why. If we have built any siblings their wheels should have higher
version numbers (e.g. like pbr versioning with a "dev" on it).
Thus we shouldn't need to force the wheels to be installed. The
--force here causes a lot of uninstalls that take up quite a bit of
time, especialy under emulation.
Change-Id: I88b824058dc1cee90bfe4c8c4fd43a86472bc478
9f6f1dd295