beaker-wizard: Include whiteboard string in the new bug link

I see BeakerWizard string is used to mark all beaker-wizard bugs.
It would probably make sense to have this set automatically when
people are using the "file a new bug link" in the documentation.

http://beaker-project.org/docs/man/beaker-wizard.html#bugs

Change-Id: I9dc0015a64f040f14f8864c9d9418ace16fd7183
Merge "beaker-wizard: Include whiteboard string in the new bug link" into develop