zdtm.sh: use tmpfs for dump files
zdtm.sh: use tmpfs for dump files

It's optional. It's going to be used in jenkins.

time bash -x test//zdtm.sh  static/maps04
real	0m40.220s
user	0m0.096s
sys	0m12.822s

time bash -x test//zdtm.sh -t static/maps04
real	0m9.904s
user	0m0.074s
sys	0m1.630s

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

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