[NFC] Further tests tidy up following removing of dbunit

tests/phpunit/CiviTest/CiviUnitTestCase.php

@@ -242,7 +242,6 @@ class CiviUnitTestCase extends PHPUnit_Framework_TestCase {
    *
    *  Initialize the test database if it hasn't been initialized
    *
-   * @return PHPUnit_Extensions_Database_DB_IDatabaseConnection connection
    */
   protected function getConnection() {
     if (!self::$dbInit) {

tools/scripts/phpunit-ls

@@ -12,9 +12,8 @@ if (!class_exists('PHPUnit_Framework_TestCase')) {
   // Note: Use eval() to prevent IDE scanners from tripping up on this.
   eval('
   class PHPUnit_Framework_TestCase {}
-  class PHPUnit_Extensions_Database_TestCase {}
   class PHPUnit_Extensions_SeleniumTestCase {}
   ');
 }
 
-\Civi\CiUtil\Command\LsCommand::main($argv);
\ No newline at end of file
+\Civi\CiUtil\Command\LsCommand::main($argv);