QAART-409 Fixing ImageServing_002_SpecialUploadTest from failing regularly

There were two fail point on this particular test. One is that the test doesn't wait for any element and try to locate the body of the tab which the body of the tab is one of the slower item to load on the page. The second issue is that the "ignore any warnings" checkbox is not always guarantee to be checked before the "upload" button is pressed. This would cause the next page load with a warning message instead of the expected File page.
https://wikia-inc.atlassian.net/browse/QAART-409