Implement Apache WSGI for Qinling

Since this review[1], Qinling supports WSGI execution.

From a production perspective, Qinling should be deployed
using Apache and mod_wsgi.

"api_worker" option is not needed anymore because processes will
be handle by Apache mod_wsgi.

Qinling Docker image review[2] has ben created.

[1] https://review.opendev.org/661851
[2] https://review.opendev.org/666647

Change-Id: I9aaee4c2932f1e4ea9fe780a64e96a28fa6bccfb
Story: 2005920
Task: 34181