Moved integration tests to namespaces

tests/PHPUnit/Integration/AccessTest.php

tests/PHPUnit/Integration/ArchiveProcessingTest.php

.../PHPUnit/Integration/AssetManager/UIAssetMinifierTest.php

tests/PHPUnit/Integration/CronArchive/FixedSiteIdsTest.php

tests/PHPUnit/Integration/CronArchive/SharedSiteIdsTest.php

tests/PHPUnit/Integration/DataAccess/ModelTest.php

tests/PHPUnit/Integration/DbTest.php

tests/PHPUnit/Integration/DocumentationGeneratorTest.php

tests/PHPUnit/Integration/HttpTest.php

tests/PHPUnit/Integration/JsProxyTest.php

tests/PHPUnit/Integration/LogTest.php

tests/PHPUnit/Integration/OptionTest.php

tests/PHPUnit/Integration/PiwikTest.php

tests/PHPUnit/Integration/Plugin/SettingsTest.php

tests/PHPUnit/Integration/ReleaseCheckListTest.php

tests/PHPUnit/Integration/ReportTest.php

tests/PHPUnit/Integration/SegmentTest.php

tests/PHPUnit/Integration/ServeStaticFileTest.php

tests/PHPUnit/Integration/SqlTest.php

tests/PHPUnit/Integration/Tracker/ActionTest.php