ordering="slug" does not work for tests.short_name

[chaws]

Extracted from Linaro/squad#952

From my discussion with @chaws

build.tests(environment=e.id,suite=s.id,ordering="short_name")

does not appear to be working for the ordering component. it appears to be ordering by id.

Is this the issue? https://github.com/Linaro/squad/blob/9472d5e337a38488d1fb44c986deec7e8a54d6e7/squad/api/rest.py#L1161 only the id is there and thus can't be filtered on other things?

[chaws]

From squad:

I looked at the code and it won't be that easy to via api. Tests are complicated as they're are just too much and we need to order them by id so we can make cursor pagination.

I'll make a generic function in squad-client so you can call it on demand, does that sound good?

[jscook2345]

I gave @chaws some of my sorting snippets and he may include them in the library.