Issue #1598578 by aspilicious: Convert form.test to PSR-0.

...modules/system/lib/Drupal/system/Tests/Form/AlterTest.php

...tem/lib/Drupal/system/Tests/Form/ArbitraryRebuildTest.php

...ules/system/lib/Drupal/system/Tests/Form/CheckboxTest.php

...dules/system/lib/Drupal/system/Tests/Form/ElementTest.php

...ystem/lib/Drupal/system/Tests/Form/ElementsLabelsTest.php

.../lib/Drupal/system/Tests/Form/ElementsTableSelectTest.php

...lib/Drupal/system/Tests/Form/ElementsVerticalTabsTest.php

...modules/system/lib/Drupal/system/Tests/Form/EmailTest.php

...system/lib/Drupal/system/Tests/Form/FileInclusionTest.php

.../modules/system/lib/Drupal/system/Tests/Form/FormTest.php

.../system/lib/Drupal/system/Tests/Form/ProgrammaticTest.php

...dules/system/lib/Drupal/system/Tests/Form/RebuildTest.php

...Drupal/system/Tests/Form/StateValuesCleanAdvancedTest.php

...tem/lib/Drupal/system/Tests/Form/StateValuesCleanTest.php

...dules/system/lib/Drupal/system/Tests/Form/StorageTest.php

...em/lib/Drupal/system/Tests/Form/TriggeringElementTest.php

core/modules/system/lib/Drupal/system/Tests/Form/UrlTest.php

...es/system/lib/Drupal/system/Tests/Form/ValidationTest.php

...dules/system/lib/Drupal/system/Tests/Form/WrapperTest.php

core/modules/system/tests/form.test