stage0/common: print stage1 debug output
stage0/common: print stage1 debug output

Currently if `rkt app --debug` is enabled we get stage1 debug output
only if an error occurs.

This fixes it by printing debug output always if it is enabled.

joshix/rkt,Shashwatsh/rkt,Shashwatsh/rkt,ybubnov/rkt,kinvolk/rkt,sstabellini/rkt,ybubnov/rkt,intelsdi-x/rkt,coreos/rkt,achanda/rkt,ybubnov/rkt,alban/rkt,coreos/rkt,joshix/rkt,shobhit85/rkt,jonboulle/rkt,shobhit85/rkt,achanda/rkt,jonboulle/rkt,dgonyeo/rkt,sstabellini/rkt,joshix/rkt,lucasallan/rkt,Shashwatsh/rkt,rkt/rkt,dgonyeo/rkt,cab105/rkt,dgonyeo/rkt,lucasallan/rkt,sstabellini/rkt,alban/rkt,lucasallan/rkt,cab105/rkt,coreos/rkt,kinvolk/rkt,intelsdi-x/rkt,intelsdi-x/rkt,cab105/rkt,rkt/rkt,joshix/rkt,rkt/rkt,shobhit85/rkt,kinvolk/rkt,alban/rkt,achanda/rkt,kinvolk/rkt,rkt/rkt,jonboulle/rkt,lucasallan/rkt