Add docstrings for test_ebs.py.
Add docstrings for test_ebs.py.

mbrukman/flocker,agonzalezro/flocker,w4ngyi/flocker,LaynePeng/flocker,moypray/flocker,AndyHuu/flocker,1d4Nf6/flocker,LaynePeng/flocker,lukemarsden/flocker,w4ngyi/flocker,jml/flocker,agonzalezro/flocker,jml/flocker,achanda/flocker,wallnerryan/flocker-profiles,1d4Nf6/flocker,adamtheturtle/flocker,1d4Nf6/flocker,LaynePeng/flocker,runcom/flocker,wallnerryan/flocker-profiles,runcom/flocker,hackday-profilers/flocker,AndyHuu/flocker,moypray/flocker,Azulinho/flocker,achanda/flocker,AndyHuu/flocker,wallnerryan/flocker-profiles,adamtheturtle/flocker,runcom/flocker,w4ngyi/flocker,jml/flocker,mbrukman/flocker,Azulinho/flocker,moypray/flocker,lukemarsden/flocker,hackday-profilers/flocker,Azulinho/flocker,lukemarsden/flocker,mbrukman/flocker,achanda/flocker,agonzalezro/flocker,adamtheturtle/flocker,hackday-profilers/flocker