By setting the auth type to DEVELOPMENT_BECOME_ANY_ACCOUNT and passing
--dev to the init process, gerrit will create an initial admin user
for us. We leverage this user to create a sample project, change,
Zuul user and sample CI result comment.
We also update testinfra to take some screenshots of gerrit and report
them back.
Change-Id: I56cda99790d3c172e10b664e57abeca10efc5566