Comment 2 for bug 1588315

Reviewed: https://review.fuel-infra.org/21553
Submitter: Lesya Novaselskaya <email address hidden>
Branch: master

Commit: 7e5c8f177b7e7e6fbdfed7a8d3f578cb3fd28c34
Author: Anton Tcitlionok <email address hidden>
Date: Thu Jun 2 12:18:48 2016

Switch to checking for lastSuccessfulBuild

This fix ports builder behaviour of 'nailgun_performance_tests' job
for master branch to 'old.nailgun_performance_tests'

Closes-Bug: #1588315

Change-Id: I27149e8f076fbb6d0978516109ff83b8c1f0b674