Fix the build after some broken servlet access tests were enabled

* These tests were previously excluded from maven due to the class name not ending in "Test"
* Since they were not run we missed keeping them up to date when the mobile upload endpoint was renamed to not be "classlist" but just "index"
* Tests implied to test access rights as our three kinds of accounts, but actually used the director account. Updated to use all three
* Two of the tests lacked any kind of asserts. Added the obvious assert to them.

Fixes #253