Add tempest-lib to the QA Program

This commit adds the newly created tempest-lib repo to the QA program.
This was created as a part of bp tempest-library, the spec can be
found at [1].

[1] http://specs.openstack.org/openstack/qa-specs/specs/tempest-library.html

Change-Id: Ie2a4077e3b5e53600af1e1d24f17932c932532fc
Merge "Add tempest-lib to the QA Program"