Remove deprecated AbstractTest class and associated references

Author: antonmedv

phpunit.xml

@@ -21,7 +21,6 @@
     </testsuite>
     <testsuite name="Legacy">
       <directory>tests/legacy/</directory>
-      <exclude>tests/legacy/AbstractTest.php</exclude>
     </testsuite>
     <testsuite name="Joy">
       <directory>tests/joy/</directory>

tests/bootstrap.php

@@ -26,7 +26,6 @@
 define('__REPOSITORY__', __DIR__ . '/fixtures/repository');
 define('__TEMP_DIR__', sys_get_temp_dir() . '/deployer');
 
-require_once __DIR__ . '/legacy/AbstractTest.php';
 require_once __DIR__ . '/joy/JoyTest.php';
 
 // Init repository