Allow to force creating a new bug (not deduplicate)

[kparal]

As a QA, I often need to create a new bug containing my backtrace. The reason is that libreport often finds a duplicate of this bug already in bugzilla, and my report is just added as a new comment. But the existing bug is private, which means I can't use it well for QA-related purposes, like proposing it as a blocker. I need a fully public bug. I have no problem uploading my backtrace publicly. But currently libreport doesn't allow me to do so, it always deduplicates it.

I tried modifying the existing private bug and removing abrt_hash from Whiteboard. But that has the following consequences:

1. I need to recreate the backtrace, which can easily take 15+ minutes
2. Libreport finds a different duplicate bug, again often private
3. Repeat again and again and hope that this time there is no more duplicate and you can finally report a new bug with full details

It would be enough for me if it was just a cmdline switch for abrt-cli, or a hidden option somewhere in abrt config. But I'd really appreciate being able to report a new bug, if needed. Thanks a lot.