Add unit tests for debug
Add unit tests for debug

This commit adds unit tests for common.debug.

Partially implements bp unit-tests

Change-Id: I3ab573942293eea72294d395ae40e92c2126708d

sebrandon1/tempest,hpcloud-mon/tempest,manasi24/tempest,Mirantis/tempest,CiscoSystems/tempest,yamt/tempest,Vaidyanath/tempest,vmahuli/tempest,pandeyop/tempest,queria/my-tempest,tonyli71/tempest,jamielennox/tempest,flyingfish007/tempest,LIS/lis-tempest,redhat-cip/tempest,neerja28/Tempest,afaheem88/tempest_neutron,zsoltdudas/lis-tempest,roopali8/tempest,afaheem88/tempest,bigswitch/tempest,vedujoshi/tempest,Tesora/tesora-tempest,jamielennox/tempest,openstack/tempest,akash1808/tempest,cisco-openstack/tempest,sebrandon1/tempest,alinbalutoiu/tempest,akash1808/tempest,izadorozhna/tempest,eggmaster/tempest,JioCloud/tempest,xbezdick/tempest,bigswitch/tempest,Lilywei123/tempest,Juraci/tempest,masayukig/tempest,tudorvio/tempest,hayderimran7/tempest,jaspreetw/tempest,dkalashnik/tempest,Juniper/tempest,vmahuli/tempest,vedujoshi/os_tempest,varunarya10/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,varunarya10/tempest,manasi24/jiocloud-tempest-qatempest,cloudbase/lis-tempest,izadorozhna/tempest,danielmellado/tempest,cloudbase/lis-tempest,pczerkas/tempest,redhat-cip/tempest,dkalashnik/tempest,NexusIS/tempest,Lilywei123/tempest,jaspreetw/tempest,queria/my-tempest,Tesora/tesora-tempest,danielmellado/tempest,afaheem88/tempest_neutron,hayderimran7/tempest,afaheem88/tempest,zsoltdudas/lis-tempest,yamt/tempest,LIS/lis-tempest,pczerkas/tempest,neerja28/Tempest,rakeshmi/tempest,eggmaster/tempest,alinbalutoiu/tempest,manasi24/tempest,rakeshmi/tempest,cisco-openstack/tempest,tudorvio/tempest,openstack/tempest,pandeyop/tempest,flyingfish007/tempest,JioCloud/tempest,nunogt/tempest,manasi24/jiocloud-tempest-qatempest,Mirantis/tempest,CiscoSystems/tempest,roopali8/tempest,xbezdick/tempest,NexusIS/tempest,hpcloud-mon/tempest,nunogt/tempest,Vaidyanath/tempest,vedujoshi/tempest,ebagdasa/tempest,rzarzynski/tempest,masayukig/tempest,Juraci/tempest,Juniper/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,ebagdasa/tempest,rzarzynski/tempest,tonyli71/tempest,vedujoshi/os_tempest