roomservice: Include forked repositories in device search

The github api defaults to not including forked repos in search results.
This causes roomservice to fail to find a device repo if it is a fork (I.E. maguro).
This commit adds the necessary argument to include forked repositories in the results
and fixes maguro syncing.

Change-Id: I50ec96316c3208e977d659a1dd90205a2b3d85b3
Signed-off-by: Evan Anderson <evan1124@gmail.com>