Oslo provides a function, to_slug() in strutils that is substantially
similar to slugify() provided in utils by python-troveclient. Remove
slugify() and use to_slug() instead.
Change-Id: I97bc7cfc2c0e7d14e7617037bff431cdc1eee50f
Closes-Bug: #1266127
Author: Christian Berendt <berendt@b1-systems.de>