Additional workflow trace logging in abstract_engine.py
Additional workflow trace logging in abstract_engine.py

Change-Id: Ibb0384d3d5c1d9b3e653cf4ce30f641fbc481576

StackStorm/mistral,StackStorm/mistral,dennybaa/mistral,openstack/mistral,TimurNurlygayanov/mistral,dennybaa/mistral,openstack/mistral