All lib_test and locallib_test classes:
- Namespaced with component (and API whenever makes sense).
- Fixed incorrect use statements with leading backslash.
- Changed code to point to global scope when needed or add new uses.
- All them passing individually.
- Complete runs passing too.
Special mention to tests under login/tests:
1) The core_login component doesn't exist.
2) But login/tests are allowed because there is a suite pointing to it (phpunit.xml).
3) So, the only possible namespace for them is "core".
4) And to avoid problems with other core testcases (under lib/tests)
they have been renamed to have login_xxxx as prefix.
All the setup/teardown/pre/post/conditions template methods
now are required to return void. This was warned with phpunit 7
and now is enforced.
At the same time, fix a few wrong function names,
provider data and param types, return statements...
