appsdk-bump-app-catalog 643 bumping sdk to 2252-c75bc99

sdk commit: RallySoftware/appsdk@86d42f11c6cd277f833ea4c5f4e072580f164642
author: Jeff Ellis
message: DE21092: Standard defect fields show "None" by default - not "-- No Entry --"

sdk commit: RallySoftware/appsdk@ec8bf84f3ceb7be448c4d8c18fcf18da4c8302b8
author: Jeff Ellis
message: DE21092: Refactor and remove dead code.