Framework: Fix broken oc_server_folder

[PVince81]

When specifying a folder in "oc_server_folder", tests do not run properly (even test_basicSync.py).

Maybe the folder isn't created automatically for users, not sure...

If we cannot fix this, we shall add a big fat comment in the config because I lost another hour trying to make smashbox run and had a value set there...

[nickvergessen]

# target folder on the server (this may not be compatible with all tests)

Not enough? 😉

Anyway, I will have a look how it "works" with our tests, although using it somewhat defeats the purpose of tests, because sometimes we need to upload into the root folder and sometimes we need to NOT upload into the root folder. If it is set, we always use a non-root folder.