Change AWS Simple template AMI back to CoreOS
Change AWS Simple template AMI back to CoreOS

This was inadvertently changed in 28e52bd6ffe8af5e49fcd2d12499ccc92476f2f9

That was supposed to just update the custom CentOS AMI, but caught the CoreOS
AMI as well

kensipe/dcos,BenWhitehead/dcos,mesosphere-mergebot/dcos,dcos/dcos,lingmann/dcos,asridharan/dcos,jeid64/dcos,branden/dcos,xinxian0458/dcos,xinxian0458/dcos,mnaboka/dcos,lingmann/dcos,BenWhitehead/dcos,branden/dcos,vishnu2kmohan/dcos,mesosphere-mergebot/dcos,BenWhitehead/dcos,surdy/dcos,darkonie/dcos,branden/dcos,darkonie/dcos,xinxian0458/dcos,vishnu2kmohan/dcos,mellenburg/dcos,BenWhitehead/dcos,jeid64/dcos,GoelDeepak/dcos,amitaekbote/dcos,mesosphere-mergebot/mergebot-test-dcos,amitaekbote/dcos,kensipe/dcos,amitaekbote/dcos,lingmann/dcos,branden/dcos,kensipe/dcos,mesosphere-mergebot/mergebot-test-dcos,dcos/dcos,asridharan/dcos,mnaboka/dcos,mesosphere-mergebot/dcos,darkonie/dcos,mnaboka/dcos,mesosphere-mergebot/dcos,amitaekbote/dcos,GoelDeepak/dcos,mellenburg/dcos,surdy/dcos,vishnu2kmohan/dcos,asridharan/dcos,surdy/dcos,GoelDeepak/dcos,lingmann/dcos,kensipe/dcos,GoelDeepak/dcos,vishnu2kmohan/dcos,dcos/dcos,xinxian0458/dcos,jeid64/dcos,mesosphere-mergebot/mergebot-test-dcos,darkonie/dcos,mnaboka/dcos,jeid64/dcos,asridharan/dcos,mesosphere-mergebot/mergebot-test-dcos,dcos/dcos,surdy/dcos,darkonie/dcos,mnaboka/dcos,dcos/dcos,mellenburg/dcos,mellenburg/dcos