Initial version of kerneltest ARC investigation

This is an initial version of the ARC investigation document for kerneltest
initiative.

It contains:
* index document with info, requirements for the project and what this
initiative needs to address
* repository enhancement investigation - what is missing in the repository
itself
* Complete rewrite stub - needs to be updated
* V2 reuse investigation - thorough investigation what is available in current
codebase, which wasn't released

Signed-off-by: Michal Konečný <mkonecny@redhat.com>

docs/kerneltest/continue_from_v2.rst

@@ -0,0 +1,59 @@
+.. _continue_from_v2:
+
+Use v2 Code Of kerneltest Application
+=====================================
+
+There is already a work in progress rewrite of kerneltest application started by Jeremy Cline,
+which was never finished. This document is investigating if this option is feasible
+and we should continue on the code already written.
+From meeting with Justin Forbes this code is not 100% ready, which is the reason it was never
+been released.
+
+What is in v2
+-------------
+
+* Some unit tests in `kerneltest/tests` (not covering everything,
+  but at least part of the code is covered) using tox
+* API calls for `/api/v1/results`
+
+  * GET method to retrieve tests information
+  * POST method to add new test run to db
+    (authentication scopes doesn't seem to be set correctly)
+  * Sending Fedora message when adding a new test run
+
+* Basic OIDC implementation using `flask_oidc` library
+* Configuration file loading and defaults
+* Forms for updating/creating release and submitting logs are in place
+* Web routes implemented
+
+  * `/index`
+  * `/login`
+  * `/logout`
+  * `/release/<release>` - information about specific fedora release
+  * `/kernel/<kernel>` - information about specific kernel version
+  * `/results/<test_run_id>` - information about specific test
+  * `/upload` - test result uploading
+  * `/stats`
+  * `/admin/new` - add new release (does emit fedora message)
+  * `/admin/<release>/edit` - edit existing release (does emit fedora message)
+
+* DB models for Test, TestRun and Release
+
+What is missing in v2
+---------------------
+
+* Documentation
+* No support for uploading logs yet
+* Web interface revitalization
+* Code itself more than 3 years old, there could be some issue with newer libraries
+
+The Good Points
+---------------
+
+1. Not starting from scratch = less work
+
+
+The Bad points
+--------------
+
+1. Make familiar with existing code = more time needed