osc-lib is a package of common support modules for writing
OSC plugins. All common functions, classes such as exceptions,
utils, logs and so on have been moved from openstackclient to
osc-lib.
So use osc-lib instead of openstackclient.
Change-Id: Ic158ee6d74f73b4629f9f35f6f29e5a4e99b5258
cf7425be7e