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 python-senlinclient.
Change-Id: I4bd58470b786d92fa39feb0d7623037ab2489cf1
a8b04d4a9c