Dockerfile: add more packages
Dockerfile: add more packages

These packages are needed for proper build:

* git-core: to get CRIU version (see Makefile)
* pkg-config, libselinux-dev: to check for selinux
  (see criu/Makefile.config)

Signed-off-by: Kir Kolyshkin <c0159612b0ef32139322233232df1a0d189c4b9b@openvz.org>
Acked-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

eabatalov/criu,AuthenticEshkinKot/criu,efiop/criu,efiop/criu,AuthenticEshkinKot/criu,eabatalov/criu,KKoukiou/criu-remote,efiop/criu,KKoukiou/criu-remote,ldu4/criu,ldu4/criu,efiop/criu,AuthenticEshkinKot/criu,KKoukiou/criu-remote,AuthenticEshkinKot/criu,ldu4/criu,KKoukiou/criu-remote,eabatalov/criu,tych0/criu,eabatalov/criu,ldu4/criu,efiop/criu,ldu4/criu,KKoukiou/criu-remote,tych0/criu,tych0/criu,eabatalov/criu,ldu4/criu,tych0/criu,AuthenticEshkinKot/criu,eabatalov/criu,tych0/criu,KKoukiou/criu-remote,tych0/criu,efiop/criu,AuthenticEshkinKot/criu