Minor change in protobuf/cgroup.proto numbering

Change-Id: Idaf8689188041c848126beb9c401bd90d0e2be69
Signed-off-by: Garrison Bellack <gbellack@google.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

protobuf/cgroup.proto

 message cgroup_dir_entry {
 	required string 		path		= 1;
-	repeated cgroup_dir_entry	children 	= 4;
+	repeated cgroup_dir_entry	children 	= 2;
 }
 
 message cg_controller_entry {