Adding constraints support to libraries is slightly more complex than
services as the libraries themselves are listed in upper-constraints.txt
which leads to errors that you can't install a specific version and a
constrained version.
This change adds constraints support by also adding a helper script to
edit the constraints to remove oslo.db.
Change-Id: I31febfe00698e36f4c2e0e41c3f7bf64acf47adf
a07e1320e7