fly: copy rkt-resolv.conf in the app
fly: copy rkt-resolv.conf in the app

If the user specified the --dns option, a file named rkt-resolv.conf
will be created in /etc in the stage1 rootfs.

If this file is present, copy it in the app so the --dns option works
in rkt fly.

nhlfr/rkt,dgonyeo/rkt,Wilybald/rkt,akshaykarle/rkt,achanda/rkt,alban/rkt,rkt/rkt,achanda/rkt,Shashwatsh/rkt,squeed/rkt,kinvolk/rkt,Wilybald/rkt,cab105/rkt,sstabellini/rkt,rkt/rkt,cab105/rkt,rkt/rkt,lucasallan/rkt,ybubnov/rkt,intelsdi-x/rkt,akshaykarle/rkt,jonboulle/rkt,nhlfr/rkt,sstabellini/rkt,squeed/rkt,jakon89/rkt,achanda/rkt,jakon89/rkt,coreos/rkt,sstabellini/rkt,shobhit85/rkt,euank/rkt,Wilybald/rkt,lucasallan/rkt,s-urbaniak/rkt,kinvolk/rkt,joshix/rkt,euank/rkt,alban/rkt,Shashwatsh/rkt,s-urbaniak/rkt,euank/rkt,nhlfr/rkt,coreos/rkt,lucasallan/rkt,squeed/rkt,shobhit85/rkt,Wilybald/rkt,jonboulle/rkt,yifan-gu/rocket,kinvolk/rkt,kinvolk/rkt,akshaykarle/rkt,cab105/rkt,yifan-gu/rocket,yifan-gu/rkt,s-urbaniak/rkt,lucasallan/rkt,jakon89/rkt,Shashwatsh/rkt,coreos/rkt,shobhit85/rkt,dgonyeo/rkt,alban/rkt,dgonyeo/rkt,intelsdi-x/rkt,jonboulle/rkt,joshix/rkt,rkt/rkt,ybubnov/rkt,joshix/rkt,joshix/rkt,yifan-gu/rkt,ybubnov/rkt,yifan-gu/rkt,yifan-gu/rocket,intelsdi-x/rkt