-quick-start steps are modified and fit more to what a reader would do
-quick-start test code is mainly splitted into 2 files, one which is a
 setup part as a role, the second one starts with cloning the test
 repository, just like all followings tutorial will do
-some elementary steps when manipulating or checking gerrit are being
 added as roles

tutorial ssh config: test ssh configuration has been modified to allow
 using a known_hosts file for both someone executing localtest and
 opendev.org's zuul. A reader executing the tutorial would still have to
 accept the fingerprint. To do so, commit-msg hook is fetched manually,
 otherwise it would be downloaded by git-review throught scp. Alas,
 git-review doesn't allow to pass options to scp to provide a new
 known_hosts file.
 User's ssh key is used if ~/.ssh/id_rsa.pub is available, otherwise use
 a generated one.

- "to_json | from_json | json_query" in test is due to an issue between
 ansible and jmespath [1]

[1] https://github.com/ansible-collections/community.general/issues/320

Change-Id: Id5c669537ff5afc7468352139980ebade167d534