Add firewall flush rules to zuul pre-update gates.
Wrap gate scripts by run-gates.sh script in order to preserve the scripts execution contexts.
Also migrated chart building process to Helm v3.x.
Fixed 020-test-divingbell.sh script.
Change-Id: I6295d55338a6a75ac43b54c092704670d61854d9
This patch set:
(a) renamed the docs folder to doc
(b) add in a basic tox.ini to generate the doc via ``tox -edocs``
(c) add in necessary /docs/requirements.txt dependencies
Change-Id: Id45db34fdc8860047047a4e6069483dfb4a56d7f
Signed-off-by: Tin Lam <tin@irrational.io>