RunTimeError on tearDownClass explained
RunTimeError on tearDownClass explained

The RunTimeError appearance on the console frequently caused
confusion, so it's message now explains the situation in a more
verbosely.

Change-Id: I904eeb09f6a7e7ea8a2121bc451d57ddf5f1d277

sorenh/tempest-lib,JioCloud/tempest-lib,mtreinish/tempest-lib,varunarya10/tempest-lib,cneill/tempest-lib,afaheem88/tempest-lib