Do a dummy import to determine which SDK is installed (Pre/post merge).
This solves the DevStack error "Cloud defaults was not found" in -tips jobs.
Depends-On: Ia111f127fbdceac2afe20fd9d1fe032145cdd72c
Change-Id: I60c2d418dd5a393eee2cc2a5c2fdebfffdabf2d3