files-reg: don't forgot about mntns_root in linked-remap
files-reg: don't forgot about mntns_root in linked-remap

All operations with files should be relative to mntns_root

Signed-off-by: Andrey Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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