Fix guessing review requests in rbt land.

Review Request #6800 — Created Jan. 17, 2015 and submitted — Latest diff uploaded

Information

RBTools
master
179833b...

Reviewers

My recent fix to prevent fetching commit and revision history twice
resulted in a breakage to rbt land, which wasn't updated for the new
parameters. This broke landing local branches.

This change fixes the arguments to allow landing to work correctly
again.

Landed a change successfully.