KeyError when tearDownClass called from setUpClass
KeyError when tearDownClass called from setUpClass

The setUpclass full chain detection realys on calling at leat
 one test_method, but this is not happening when the setUpClass
failing.

Partially Fixing Bug: 1218279

Change-Id: I679d328591b10c8f0a8f3cb66ba250cdff2ecf05

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