refs #5940 fix namespaces

tests/PHPUnit/System/AnnotationsTest.php

tests/PHPUnit/System/ApiGetReportMetadataTest.php

tests/PHPUnit/System/ApiGetReportMetadataYearTest.php

tests/PHPUnit/System/ArchiveCronTest.php

tests/PHPUnit/System/ArchiveInvalidationTest.php

tests/PHPUnit/System/ArchiveWebTest.php

tests/PHPUnit/System/AutoSuggestAPITest.php

tests/PHPUnit/System/BackwardsCompatibility1XTest.php

tests/PHPUnit/System/BlobReportLimitingTest.php

tests/PHPUnit/System/CsvExportTest.php

tests/PHPUnit/System/CustomEventsTest.php

tests/PHPUnit/System/EcommerceOrderWithItemsTest.php

tests/PHPUnit/System/FlattenReportsTest.php

tests/PHPUnit/System/ImportLogsTest.php

tests/PHPUnit/System/LabelFilterTest.php

tests/PHPUnit/System/ManyVisitorsOneWebsiteTest.php

tests/PHPUnit/System/MultipleSitesArchivingTest.php

tests/PHPUnit/System/NoVisitTest.php

tests/PHPUnit/System/NonUnicodeTest.php

tests/PHPUnit/System/OneVisitorLongUrlsTruncatedTest.php