Refactor exception handling
Refactor exception handling

Logging exceptions is now cleaner and more understandable.

Change-Id: I679031d1e4c945088c8a7508aa0286bb2d6eb4f0

zsoltdudas/lis-tempest,izadorozhna/tempest,bigswitch/tempest,Tesora/tesora-tempest,rakeshmi/tempest,tudorvio/tempest,JioCloud/tempest,NexusIS/tempest,manasi24/jiocloud-tempest-qatempest,Tesora/tesora-tempest,xbezdick/tempest,Juniper/tempest,pczerkas/tempest,openstack/tempest,sebrandon1/tempest,masayukig/tempest,masayukig/tempest,tonyli71/tempest,izadorozhna/tempest,hayderimran7/tempest,NexusIS/tempest,alinbalutoiu/tempest,flyingfish007/tempest,nunogt/tempest,pandeyop/tempest,vedujoshi/tempest,openstack/tempest,varunarya10/tempest,dkalashnik/tempest,JioCloud/tempest,vedujoshi/tempest,rakeshmi/tempest,manasi24/tempest,cisco-openstack/tempest,xbezdick/tempest,zsoltdudas/lis-tempest,sebrandon1/tempest,varunarya10/tempest,akash1808/tempest,tonyli71/tempest,flyingfish007/tempest,alinbalutoiu/tempest,manasi24/jiocloud-tempest-qatempest,LIS/lis-tempest,Juniper/tempest,roopali8/tempest,nunogt/tempest,Juraci/tempest,cisco-openstack/tempest,tudorvio/tempest,LIS/lis-tempest,bigswitch/tempest,Juraci/tempest,pczerkas/tempest,pandeyop/tempest,akash1808/tempest,roopali8/tempest,hayderimran7/tempest,manasi24/tempest,dkalashnik/tempest