So far, the Tobiko docs were duplicated in some places, different
(although duplicated), and some fragments were not relevant (or
outdated).
This patch refactors the run test cases part of Tobiko quick start
guide by modularizing the fragments ("spilling" fragments instead of
coping them), correcting typos, and deleting/updating irrelevant
information.
Change-Id: I685182cde8573e80ecaabe8216530b903df759e1
3d04906a9f