stage1/init: use path relative to stage1 in Read.*Directories
stage1/init: use path relative to stage1 in Read.*Directories

Systemd doesn't take paths relative to RootDirectory when specifying
ReadWriteDirectories and ReadOnlyDirectories.

jonboulle/rkt,jonboulle/rkt,matthaias/rkt,Wilybald/rkt,dgonyeo/rkt,nhlfr/rkt,dgonyeo/rkt,Shashwatsh/rkt,sstabellini/rkt,euank/rkt,coreos/rkt,tmrts/rkt,alban/rkt,jakon89/rkt,nhlfr/rkt,lucasallan/rkt,monstermunchkin/rkt,sstabellini/rkt,sstabellini/rkt,mike1729/rkt,cab105/rkt,joshix/rkt,squeed/rkt,yifan-gu/rkt,coreos/rkt,achanda/rkt,dgonyeo/rkt,rkt/rkt,Wilybald/rkt,shobhit85/rkt,shobhit85/rkt,intelsdi-x/rkt,ybubnov/rkt,akshaykarle/rkt,yifan-gu/rocket,akshaykarle/rkt,ybubnov/rkt,coreos/rkt,alban/rkt,kinvolk/rkt,yifan-gu/rocket,ybubnov/rkt,jjlakis/rkt,cab105/rkt,jjlakis/rkt,akshaykarle/rkt,tmrts/rkt,monstermunchkin/rkt,sgotti/rkt,lucasallan/rkt,s-urbaniak/rkt,intelsdi-x/rkt,mike1729/rkt,achanda/rkt,achanda/rkt,cab105/rkt,kinvolk/rkt,kinvolk/rkt,euank/rkt,Wilybald/rkt,shobhit85/rkt,jonboulle/rkt,s-urbaniak/rkt,Wilybald/rkt,squeed/rkt,rkt/rkt,Shashwatsh/rkt,euank/rkt,intelsdi-x/rkt,yifan-gu/rkt,tmrts/rkt,s-urbaniak/rkt,jjlakis/rkt,yifan-gu/rocket,lucasallan/rkt,Shashwatsh/rkt,sgotti/rkt,monstermunchkin/rkt,rkt/rkt,matthaias/rkt,alban/rkt,kinvolk/rkt,squeed/rkt,lucasallan/rkt,joshix/rkt,jakon89/rkt,rkt/rkt,yifan-gu/rkt,nhlfr/rkt,joshix/rkt,sgotti/rkt,jakon89/rkt,matthaias/rkt,joshix/rkt,mike1729/rkt