app-container: cleanup fileset information
app-container: cleanup fileset information

Make filesets an optional detail of the spec and focus on just the app
container image first.

rot26/rkt,jiachenning/rocket,linki/rkt,wparad/rkt,iaguis/rkt,matthaias/rkt,marineam/rkt,sinfomicien/rkt,mattthias/pkg-rkt,bramvdbogaerde/rocket-arm,Yhgenomics/rkt,joshix/rkt,ramitsurana/rkt,monstermunchkin/rkt,kinvolk/rkt,mike1729/rkt,Wilybald/rkt,il9ue/rkt,dgonyeo/rkt,marineam/rkt,endocode/rkt,tixxdz/rkt,klizhentas/rkt,sgotti/rkt,coreos/rkt,ramitsurana/rkt,robszumski/rocket,michelangelo13/rkt,alban/rkt,sgotti/rkt,rkt/rkt,jakon89/rkt,euank/rkt,lsm5/rkt,Yhgenomics/rkt,ChengTiesheng/rkt,crawford/rkt,intfrr/rkt,alban/rkt,klizhentas/rkt,lee212/rkt,smarvin/rkt,markllama/rkt,ramitsurana05/rkt,fdserr/rkt,alexhersh/rkt,cab105/rkt,achanda/rkt,clearlinux/rkt,liubq919/rkt,il9ue/rkt,achanda/rkt,sstabellini/rkt,smarvin/rkt,liugenping/rkt,jakon89/rkt,squeed/rkt,jasonchaffee/rkt,jjlakis/rkt,tv42/rkt,joshix/rkt,yifan-gu/rocket,jonboulle/rkt,jonboulle/rkt,alban/rkt,blixtra/rkt,MattDees/rkt,joshix/rkt,lucasallan/rkt,michelangelo13/rkt,rhvgoyal/rkt,s-urbaniak/rkt,lee212/rkt,dalanlan/rkt,xnox/rkt,linki/rkt,lsm5/rkt,ChengTiesheng/rkt,wparad/rkt,robszumski/rocket,iankronquist/rkt,endocode/rkt,MattDees/rkt,nhlfr/rkt,mjg59/rkt,liubq919/rkt,jjlakis/rkt,gdi2290/rocket,lucasallan/rkt,adfernandes/rkt,chrisseto/rkt,shobhit85/rkt,ybubnov/rkt,mike1729/rkt,Yhgenomics/rkt,kinvolk/rkt,squaremo/rkt,liugenping/rkt,ramitsurana05/rkt,Shashwatsh/rkt,kbrwn/rkt,alexhersh/rkt,coreos/rkt,dalanlan/rkt,mattthias/pkg-rkt,iankronquist/rkt,smarvin/rkt,shtouff/rkt,clearlinux/rkt,tmrts/rkt,wparad/rkt,luebken/rkt,lucasallan/rkt,cab105/rkt,jasonchaffee/rkt,squeed/rkt,iankronquist/rkt,markllama/rkt,luebken/rkt,jzelinskie/rkt,rkt/rkt,kbrwn/rkt,akshaykarle/rkt,luebken/rkt,jiachenning/rocket,rhvgoyal/rkt,yifan-gu/rkt,MattDees/rkt,marineam/rkt,jjlakis/rkt,achanda/rkt,nhlfr/rkt,MabinGo/rkt,crawford/rkt,xnox/rkt,maquanyi/rkt,dgonyeo/rkt,intelsdi-x/rkt,yifan-gu/rkt,squaremo/rkt,krnowak/rkt,monstermunchkin/rkt,kinvolk/rkt,shtouff/rkt,iaguis/rkt,eyakubovich/rkt,maquanyi/rkt,endocode/rkt,ybubnov/rkt,tixxdz/rkt,tv42/rkt,squaremo/rkt,klizhentas/rkt,fdserr/rkt,jzelinskie/rkt,Wilybald/rkt,alexhersh/rkt,linki/rkt,squeed/rkt,jakon89/rkt,mattthias/pkg-rkt,s-urbaniak/rkt,matthaias/rkt,crawford/rkt,tixxdz/rkt,akshaykarle/rkt,Shashwatsh/rkt,bramvdbogaerde/rocket-arm,clearlinux/rkt,michelangelo13/rkt,euank/rkt,joshix/rkt,tv42/rkt,coreos/rkt,nhlfr/rkt,ChengTiesheng/rkt,jzelinskie/rkt,robszumski/rocket,liugenping/rkt,il9ue/rkt,chrisseto/rkt,gdi2290/rocket,chrisseto/rkt,ybubnov/rkt,bsmr-go/rkt,kbrwn/rkt,euank/rkt,sgotti/rkt,bsmr-go/rkt,markllama/rkt,maquanyi/rkt,Wilybald/rkt,krnowak/rkt,adfernandes/rkt,philips/rkt,shobhit85/rkt,xnox/rkt,jasonchaffee/rkt,intelsdi-x/rkt,intelsdi-x/rkt,sstabellini/rkt,fdserr/rkt,shobhit85/rkt,rhvgoyal/rkt,s-urbaniak/rkt,tmrts/rkt,yifan-gu/rocket,dgonyeo/rkt,adfernandes/rkt,jonboulle/rkt,rkt/rkt,liubq919/rkt,yifan-gu/rkt,mjg59/rkt,MabinGo/rkt,shtouff/rkt,rot26/rkt,intfrr/rkt,blixtra/rkt,cab105/rkt,bsmr-go/rkt,tmrts/rkt,ramitsurana/rkt,rot26/rkt,matthaias/rkt,lsm5/rkt,eyakubovich/rkt,ramitsurana05/rkt,philips/rkt,Shashwatsh/rkt,akshaykarle/rkt,eyakubovich/rkt,dalanlan/rkt,krnowak/rkt,sinfomicien/rkt,yifan-gu/rocket,kinvolk/rkt,iaguis/rkt,mike1729/rkt,Wilybald/rkt,lucasallan/rkt,sinfomicien/rkt,MabinGo/rkt,sstabellini/rkt,rkt/rkt,monstermunchkin/rkt,blixtra/rkt,mjg59/rkt,lee212/rkt,intfrr/rkt