Implement TimeZoneInfo.GetSystemTimeZones() on Linux
Implement TimeZoneInfo.GetSystemTimeZones() on Linux

Implementing GetSystemTimeZones on Linux by reading
the zone.tab file on the machine, parsing out the
valid TimeZone IDs from it, and using those Ids to read
all the time zones on the machine.

bartonjs/coreclr,mokchhya/coreclr,krixalis/coreclr,blackdwarf/coreclr,kyulee1/coreclr,cshung/coreclr,James-Ko/coreclr,sperling/coreclr,qiudesong/coreclr,pgavlin/coreclr,wkchoy74/coreclr,naamunds/coreclr,geertdoornbos/coreclr,wtgodbe/coreclr,wkchoy74/coreclr,tijoytom/coreclr,mmitche/coreclr,serenabenny/coreclr,dkorolev/coreclr,russellhadley/coreclr,SlavaRa/coreclr,Dmitry-Me/coreclr,JonHanna/coreclr,wateret/coreclr,yeaicc/coreclr,iamjasonp/coreclr,roncain/coreclr,blackdwarf/coreclr,taylorjonl/coreclr,sejongoh/coreclr,bartonjs/coreclr,OryJuVog/coreclr,krytarowski/coreclr,SlavaRa/coreclr,bartonjs/coreclr,dpodder/coreclr,ramarag/coreclr,dasMulli/coreclr,yeaicc/coreclr,neurospeech/coreclr,shahid-pk/coreclr,cmckinsey/coreclr,alexperovich/coreclr,krixalis/coreclr,chuck-mitchell/coreclr,krytarowski/coreclr,chuck-mitchell/coreclr,ZhichengZhu/coreclr,sejongoh/coreclr,mokchhya/coreclr,gitchomik/coreclr,bitcrazed/coreclr,swgillespie/coreclr,JonHanna/coreclr,chrishaly/coreclr,andschwa/coreclr,James-Ko/coreclr,shana/coreclr,poizan42/coreclr,chuck-mitchell/coreclr,pgavlin/coreclr,KrzysztofCwalina/coreclr,ramarag/coreclr,MCGPPeters/coreclr,kyulee1/coreclr,rartemev/coreclr,Lucrecious/coreclr,matthubin/coreclr,poizan42/coreclr,mokchhya/coreclr,blackdwarf/coreclr,mokchhya/coreclr,shahid-pk/coreclr,Dmitry-Me/coreclr,swgillespie/coreclr,xoofx/coreclr,shana/coreclr,mokchhya/coreclr,ragmani/coreclr,jhendrixMSFT/coreclr,dkorolev/coreclr,Godin/coreclr,stormleoxia/coreclr,bjjones/coreclr,iamjasonp/coreclr,sjsinju/coreclr,sejongoh/coreclr,ZhichengZhu/coreclr,taylorjonl/coreclr,matthubin/coreclr,ericeil/coreclr,gkhanna79/coreclr,jamesqo/coreclr,Lucrecious/coreclr,ruben-ayrapetyan/coreclr,YongseopKim/coreclr,gkhanna79/coreclr,bitcrazed/coreclr,neurospeech/coreclr,serenabenny/coreclr,SlavaRa/coreclr,James-Ko/coreclr,Sridhar-MS/coreclr,krixalis/coreclr,AlfredoMS/coreclr,YongseopKim/coreclr,sejongoh/coreclr,KrzysztofCwalina/coreclr,poizan42/coreclr,stormleoxia/coreclr,bartonjs/coreclr,schellap/coreclr,taylorjonl/coreclr,DasAllFolks/coreclr,taylorjonl/coreclr,tijoytom/coreclr,jhendrixMSFT/coreclr,wtgodbe/coreclr,parjong/coreclr,martinwoodward/coreclr,vinnyrom/coreclr,sjsinju/coreclr,ZhichengZhu/coreclr,cmckinsey/coreclr,roncain/coreclr,MCGPPeters/coreclr,manu-silicon/coreclr,sperling/coreclr,sperling/coreclr,wateret/coreclr,Samana/coreclr,bjjones/coreclr,KrzysztofCwalina/coreclr,MCGPPeters/coreclr,mocsy/coreclr,naamunds/coreclr,bjjones/coreclr,qiudesong/coreclr,MCGPPeters/coreclr,GuilhermeSa/coreclr,Dmitry-Me/coreclr,dkorolev/coreclr,jamesqo/coreclr,zmaruo/coreclr,SpotLabsNET/coreclr,MCGPPeters/coreclr,tijoytom/coreclr,qiudesong/coreclr,ragmani/coreclr,chaos7theory/coreclr,cmckinsey/coreclr,gitchomik/coreclr,rartemev/coreclr,bartdesmet/coreclr,hseok-oh/coreclr,chrishaly/coreclr,martinwoodward/coreclr,qiudesong/coreclr,cmckinsey/coreclr,DasAllFolks/coreclr,sagood/coreclr,sagood/coreclr,Samana/coreclr,sejongoh/coreclr,parjong/coreclr,yeaicc/coreclr,sjsinju/coreclr,kyulee1/coreclr,dasMulli/coreclr,blackdwarf/coreclr,krytarowski/coreclr,poizan42/coreclr,JosephTremoulet/coreclr,AlexGhiondea/coreclr,LLITCHEV/coreclr,mmitche/coreclr,gkhanna79/coreclr,DasAllFolks/coreclr,wtgodbe/coreclr,wateret/coreclr,blackdwarf/coreclr,yizhang82/coreclr,geertdoornbos/coreclr,dkorolev/coreclr,gitchomik/coreclr,jamesqo/coreclr,sjsinju/coreclr,dkorolev/coreclr,SlavaRa/coreclr,James-Ko/coreclr,pgavlin/coreclr,rartemev/coreclr,Godin/coreclr,perfectphase/coreclr,chrishaly/coreclr,Sridhar-MS/coreclr,GuilhermeSa/coreclr,alexperovich/coreclr,Sridhar-MS/coreclr,AlexGhiondea/coreclr,cydhaselton/coreclr,JonHanna/coreclr,Lucrecious/coreclr,dasMulli/coreclr,wkchoy74/coreclr,roncain/coreclr,stormleoxia/coreclr,LLITCHEV/coreclr,ragmani/coreclr,bitcrazed/coreclr,krk/coreclr,martinwoodward/coreclr,naamunds/coreclr,orthoxerox/coreclr,bitcrazed/coreclr,benpye/coreclr,Sridhar-MS/coreclr,neurospeech/coreclr,jhendrixMSFT/coreclr,gitchomik/coreclr,mmitche/coreclr,josteink/coreclr,orthoxerox/coreclr,yizhang82/coreclr,swgillespie/coreclr,SpotLabsNET/coreclr,wkchoy74/coreclr,hseok-oh/coreclr,alexperovich/coreclr,OryJuVog/coreclr,dpodder/coreclr,xoofx/coreclr,martinwoodward/coreclr,matthubin/coreclr,sjsinju/coreclr,stormleoxia/coreclr,AlfredoMS/coreclr,cydhaselton/coreclr,manu-silicon/coreclr,qiudesong/coreclr,naamunds/coreclr,yeaicc/coreclr,bartdesmet/coreclr,krixalis/coreclr,naamunds/coreclr,josteink/coreclr,ericeil/coreclr,shana/coreclr,pgavlin/coreclr,dasMulli/coreclr,vinnyrom/coreclr,ktos/coreclr,russellhadley/coreclr,ytechie/coreclr,schellap/coreclr,Djuffin/coreclr,schellap/coreclr,zmaruo/coreclr,kyulee1/coreclr,xoofx/coreclr,perfectphase/coreclr,gitchomik/coreclr,ramarag/coreclr,perfectphase/coreclr,JonHanna/coreclr,AlexGhiondea/coreclr,wtgodbe/coreclr,swgillespie/coreclr,taylorjonl/coreclr,russellhadley/coreclr,mmitche/coreclr,cshung/coreclr,ytechie/coreclr,martinwoodward/coreclr,ktos/coreclr,vinnyrom/coreclr,swgillespie/coreclr,Alcaro/coreclr,benpye/coreclr,cshung/coreclr,chuck-mit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