tempest cleanup - don't initialize admin id's

Tempest cleanup gathers the project, user, and role id. Since
commit a857880423, this info is collected but not used. In
specific cases this method raises an error so it's better to
remove it.

Closes-bug: #2003125
Change-Id: Icd71a2962808628edb611257ac544f0277cde1f3
1 file changed