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-searchlightclient.
Change-Id: If6860db51e16a9424e8a15e1b92b2cb0b6f8bc21
69e4c73ce4