comment added
added blockedByBug 1057329 - rhsm-debug system <space> <TAB><TAB> does
not auto complete
added a workaround for Bug 1069291 - product attributes with
support_level=Layered also need support_level_exempt=true
added blockedByBug-1069230 - need to allow pass through for a
few new candlepin APIs (content_overrides and guestids)