1. add skyline-functional-devstack which inherits from devstack
2. add skyline-functional-devstack into check and gate job
3. add playbook to integrate with devstack for zuul
4. change the port from 8080 to 9999 because the 8080 is used for s3api
5. rename functional-py38 as unittest-py38
6. add install extra tools ready for skyline-console's e2e test
Change-Id: I7f4b549bec6573661e62dd2bd9a3355253afd47d
When using http protocol to access, nginx will respond with 400 and
report "400 The plain HTTP request was sent to HTTPS port".
The reason is that http 497 error[1] appeared in nginx, so 497
error was redirected to https protocol.
[1] 56f5331683/src/http/ngx_http_special_response.c (L274)
Change-Id: I01c35318dd5d219dbb31e6a89bdc05d2a4db7804
