containers: added sysvipc/shm_comm.c

* Tests communication over shared memory segments (shm)
  with identical keys between two separate IPC namespaces

Signed-off-by: Matus Marhefka <mmarhefk@redhat.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
containers: added sysvipc/msg_comm.c

* Tests communication over message queues with identical
  keys between two separate IPC namespaces

Signed-off-by: Matus Marhefka <mmarhefk@redhat.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
containers: added sysvipc/sem_comm.c

* Tests communication over semaphore sets with identical
  keys between two separate IPC namespaces

Signed-off-by: Matus Marhefka <mmarhefk@redhat.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>