Fix GetConfigNames on windows
Fix GetConfigNames on windows

The implementation made an assumption about slash-separation in a
regex. That was silly of me.

BUG=#709

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