Only allow mongodb auth backend to be used in debug (non-production) mode.
Update affected tests.
Move the test file into the unit/ directory.
Simply deploy docs and move advanced api service docs in a separate file which
is not included for now.

We will include it as soon as we re-organize the docs and figure a better place
for it.
Update affected test.
Move test in the right directory.
Update affected test.
Fix merge conflict resolution.