criu: Version 2.6

So, this time we have quite a lot of new features for a monthly
release cadence, including --leave-stopped on restore, TMEM for
PPC and shmem changes tracking.

Also bugfixes, of course, and a little bit more deprecations.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Makefile.versions

 #
 # CRIU version.
 CRIU_VERSION_MAJOR	:= 2
-CRIU_VERSION_MINOR	:= 5
+CRIU_VERSION_MINOR	:= 6
 CRIU_VERSION_SUBLEVEL	:=
 CRIU_VERSION_EXTRA	:=
-CRIU_VERSION_NAME	:= Concrete Oriole
+CRIU_VERSION_NAME	:= Paper Crane
 CRIU_VERSION		:= $(CRIU_VERSION_MAJOR)$(if $(CRIU_VERSION_MINOR),.$(CRIU_VERSION_MINOR))$(if $(CRIU_VERSION_SUBLEVEL),.$(CRIU_VERSION_SUBLEVEL))$(if $(CRIU_VERSION_EXTRA),.$(CRIU_VERSION_EXTRA))
 
 export CRIU_VERSION_MAJOR CRIU_VERSION_MINOR CRIU_VERSION_SUBLEVEL