mounts: Connect sub-root to the main root as children
mounts: Connect sub-root to the main root as children

Each sub-namespace is restored as sub-tree of the root mntns, so
the parent of sub-mntns root is the root of the root mntns.

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

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