crtools: Merge pstree collecting into showing
crtools: Merge pstree collecting into showing

1. There's no need in collecting children list in shower
2. There's no need in reading file twice -- we can collect and
   show everything in one go.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>
Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>

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