appsdk-bump-app-catalog 406 bumping sdk to 1831-6d6e8e0

sdk commit: RallySoftware/appsdk@6d6e8e02e0f60fce6db9f9e42192c718e362cfb7
author: Kyle Morse
message: DE20389: Get defectsuite/defects, testset/testcases popovers working on board/grid