Optimizations and fixes for tests

Problem/Motivation

Currently the setUp method in UUIDTestCase class is redundant and should not be exist because it have no logic which could be used by any child class.

   /**
    * {@inheritdoc}
    */
   protected function setUp() {
     parent::setUp(func_get_args());
   }

The code above passes an array of module names to a parent class. The setUp of the DrupalWebTestCase class can take an array of modules as a first argument or a list of argument where every single one is a module name.

Also, previous changes affected name of the assertUUID method in UUIDTestCase class - method have been renamed to assertUuid but its invocations have not been changed (we have the assertUuid method but invoke the assertUUID).

The UUIDTestCase class have no testing methods and should be declared as abstract.

Proposed resolution

1. Remove the setUp method from UUIDTestCase class.
2. Change all assertUUID by assertUuid.
3. Pass an array as a first argument for every setUp method.
4. Declare UUIDTestCase as abstract.

Remaining tasks

None.

User interface changes

None.

API changes

None.

Data model changes

None.