Adding waits to resolve timing issues on test_devel_sections.py

[cathal-bailey]

• Tests were failing ~50/60% of the time due to race condition/timing issue in dev portal
• Using @backoff to retry on failed assertions. Pytestmark added to facilitate backoff decorator.
• Reliability of test greatly improved with this change. No fails observed locally after addition of wait times.

[mastastny]

We don't use sleep unless it is the only option. In this case, I would rather use backof library, as we do in other tests.

[cathal-bailey]

We don't use sleep unless it is the only option. In this case, I would rather use backof library, as we do in other tests.

Okay, I did a quick testsuite search and I saw sleep being used in a couple of places, so I figured a backoff may be over-kill for this change. I can make that update.

[mdujava]

This patch contains unnecessary move of pytest.makr.issue and new blank lines

[cathal-bailey]

This patch contains unnecessary move of pytest.makr.issue and new blank lines

When I was testing, there appeared to be a conflict between the @backoff and @pytest.mark.skipif("TESTED_VERSION < Version('2.14-dev')"). I moved these decorators to module-level pytestmark block and this resolved the errors I was seeing.

I will remove the unnecessary blank lines and re-commit, and I can also dig deeper into the errors coming from TESTED_VERSION, if you would rather leave the decorators as they were.