Fix test caching
Fix test caching

-We can't pass None as request, cause when it is
 combined with memoized_method, it is cached for the
 whole test run.
-Memoized method is caching based on parameters so,
 easiest option is to put there object() which will be
 different each time and caching will work properly.
 (like per request cache)

Change-Id: I5847bd6d031caaeb6ae21817e9f2c4c10d27f325

rdo-management/tuskar-ui,rdo-management/tuskar-ui,rdo-management/tuskar-ui,rdo-management/tuskar-ui