All integration configs for Review Board automatically include a local

site field. In the case where there were no fieldsets, all the fields

would show up fine, but if the form tried to group things, the local

site field would disappear. This is because the djblets form was

defining the basic info fieldset with only the "name" and "enable"

fields.
I've fixed the Review Board form to properly override the basic info

fieldset, so that local site shows up everywhere.

Loaded some integration config forms that previously exhibited a missing

"Local Site" field. Saw the field appear.