fleet: fix deprecated docker flag
fleet: fix deprecated docker flag
mischief/coreos-docs,coreos/docs,hkjn/docs-1,iankronquist/docs,jdloft/docs,robszumski/docs,jonboulle/docs,michelleN/docs,atxwebs/docs,endocode/coreos-docs,skynet/docs,wli6/docs,joshix/docs,bq-xiao/docs,marineam/coreos-docs,mjg59/docs