update_distfiles: use gsutil rsync instead of cp
update_distfiles: use gsutil rsync instead of cp

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