gdash: remove 'intervals' options

I added this in I144d9dc43, not realizing that our fork of Gdash does not
support this functionality. Merging updates from upstream isn't simple since
Gdash accumulated several unpackaged dependencies.

Change-Id: I6a818a6bb92376c649316356cc515098cf1dd575
Merge "gdash: remove 'intervals' options" into production