Added ext storage app in autotest unit test run

To make sure that the dynamic mount config and config classes from
external storages are tested, these are now added into the autotest.sh
test run by enabling the app.

@DeepDiver1975 before that the config classes weren't tested and were failing!

@Xenopathic it looks like this PR fixes the test errors you got, maybe because I had to remove the extra `require` on top.