Added required user field to Rietveld config
Added required user field to Rietveld config

R=sullivan@chromium.org

Review URL: https://codereview.chromium.org/1142323004

benschmaus/catapult,dstockwell/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,modulexcite/catapult,sahiljain/catapult,benschmaus/catapult,sahiljain/catapult,scottmcmaster/catapult,danbeam/catapult,danbeam/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult,0x90sled/catapult,danbeam/catapult,SummerLW/Perf-Insight-Report,dstockwell/catapult,sahiljain/catapult,0x90sled/catapult,catapult-project/catapult,catapult-project/catapult,SummerLW/Perf-Insight-Report,scottmcmaster/catapult,benschmaus/catapult,0x90sled/catapult,catapult-project/catapult-csm,zeptonaut/catapult,catapult-project/catapult,dstockwell/catapult,modulexcite/catapult,modulexcite/catapult,catapult-project/catapult,dstockwell/catapult,sahiljain/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,zeptonaut/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult,sahiljain/catapult,danbeam/catapult,sahiljain/catapult,benschmaus/catapult,zeptonaut/catapult,scottmcmaster/catapult,catapult-project/catapult