ami: add new Soeul region
ami: add new Soeul region

mjg59/scripts,coreos/scripts,marineam/coreos-scripts,smilart/scripts,mjg59/scripts,marineam/coreos-scripts,smilart/scripts,marineam/coreos-scripts,glevand/coreos--scripts,mjg59/scripts,smilart/scripts,glevand/coreos--scripts,coreos/scripts