Refs #3163, add integration tests (in PHP) for log importer.

misc/log-analytics/import_logs.py

tests/PHPUnit/Integration/ImportLogsTest.php

tests/PHPUnit/IntegrationTestCase.php

tests/integration/ImportLogs.test.php

tests/integration/Integration.php

...n/expected/test_ImportLogs__Actions.getDownload_month.xml

.../expected/test_ImportLogs__Actions.getDownloads_month.xml

...ted/test_ImportLogs__Actions.getEntryPageTitles_month.xml

...ected/test_ImportLogs__Actions.getEntryPageUrls_month.xml

...cted/test_ImportLogs__Actions.getExitPageTitles_month.xml

...pected/test_ImportLogs__Actions.getExitPageUrls_month.xml

...on/expected/test_ImportLogs__Actions.getOutlink_month.xml

...n/expected/test_ImportLogs__Actions.getOutlinks_month.xml

.../expected/test_ImportLogs__Actions.getPageTitle_month.xml

...expected/test_ImportLogs__Actions.getPageTitles_month.xml

...on/expected/test_ImportLogs__Actions.getPageUrl_month.xml

...n/expected/test_ImportLogs__Actions.getPageUrls_month.xml

...tegration/expected/test_ImportLogs__Actions.get_month.xml

...t_ImportLogs__CoreAdminHome.getKnownSegmentsToArchive.xml

...t_ImportLogs__CoreAdminHome.getWebsiteIdsToInvalidate.xml