When using the --dev flag during init, parameters suitable for
development are chosen by default.
Devs that often setup new gerrit_testsites, may now use --batch
to quickly get a new site up and running.
As of now, only development_become_any_account is defaulted as
the InitAuth method, but in the future we may use the flag to help
populate the test_site with a test data (repo, change or other
logic that may help gerrit developers quickly get up and running).
Change-Id: I87dca7e325f27a35859925fbdb5cfe37367a73d9
dd614cb6f6