OSOE-629: Test Features Guard with recipe import too

[Piedone]

OSOE-629
Fixes #61

[Psichorex]

I think we should also include a test which is retrieving the Dictionary from the appsettings.json and simultaneously from the Program.cs because currently the json part is not tested as per getting it from the appsettings directly.
But that one will only work as desired after we merge the latest changes into Hosting Tenants with the OC 1.6 upgrade branch so OSOE-548 in PR #55
What dou think?

[Piedone]

Both of these configurations are really the same thing: when you add a config to appsettings, it'll be loaded into the same IShellConfiguration that you directly interact with from Program. I don't really see a point testing that (while it's theoretically possibly that something break in this, that would mean that something is fundamentally broken in ASP.NET Core or OC, what we'd notice by all UI tests, since they all rely on such config working, breaking).