net: bug fix: suppress errors printed out if no ports were exposed
net: bug fix: suppress errors printed out if no ports were exposed

If no ports are exposed, no corresponding iptables rules get installed.
Unfortunately, on the teardown path, there's no good way to test for
that or issue deletes that succeed if there's nothing to do. Therefore
it's better to just ignore these errors on the cleanup path.

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