rpc: Send EMPTY message with success == fail in case of unsupported request
rpc: Send EMPTY message with success == fail in case of unsupported request

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

efiop/criu,gonkulator/criu,ldu4/criu,kawamuray/criu,biddyweb/criu,efiop/criu,gonkulator/criu,eabatalov/criu,ldu4/criu,gablg1/criu,eabatalov/criu,AuthenticEshkinKot/criu,fbocharov/criu,marcosnils/criu,sdgdsffdsfff/criu,gonkulator/criu,efiop/criu,tych0/criu,marcosnils/criu,svloyso/criu,tych0/criu,sdgdsffdsfff/criu,AuthenticEshkinKot/criu,AuthenticEshkinKot/criu,AuthenticEshkinKot/criu,biddyweb/criu,wtf42/criu,ldu4/criu,tych0/criu,KKoukiou/criu-remote,kawamuray/criu,wtf42/criu,marcosnils/criu,tych0/criu,eabatalov/criu,efiop/criu,ldu4/criu,AuthenticEshkinKot/criu,svloyso/criu,gablg1/criu,AuthenticEshkinKot/criu,rentzsch/criu,gablg1/criu,gablg1/criu,svloyso/criu,rentzsch/criu,biddyweb/criu,svloyso/criu,ldu4/criu,LK4D4/criu,efiop/criu,biddyweb/criu,gablg1/criu,rentzsch/criu,biddyweb/criu,KKoukiou/criu-remote,marcosnils/criu,gonkulator/criu,sdgdsffdsfff/criu,ldu4/criu,sdgdsffdsfff/criu,KKoukiou/criu-remote,kawamuray/criu,wtf42/criu,kawamuray/criu,fbocharov/criu,tych0/criu,marcosnils/criu,LK4D4/criu,rentzsch/criu,KKoukiou/criu-remote,efiop/criu,sdgdsffdsfff/criu,eabatalov/criu,fbocharov/criu,svloyso/criu,kawamuray/criu,kawamuray/criu,marcosnils/criu,LK4D4/criu,wtf42/criu,wtf42/criu,sdgdsffdsfff/criu,biddyweb/criu,LK4D4/criu,wtf42/criu,fbocharov/criu,rentzsch/criu,svloyso/criu,fbocharov/criu,eabatalov/criu,gablg1/criu,LK4D4/criu,fbocharov/criu,gonkulator/criu,KKoukiou/criu-remote,tych0/criu,eabatalov/criu,LK4D4/criu,gonkulator/criu,rentzsch/criu,KKoukiou/criu-remote