Remove integration type without container manager from container integration

Remove integration type without container manager from container integration

Existing container integration was supporing with container-manager and
without container-manager integration.  After the scarthgap update,
systemd cgroup-v1 and v2 mixed support was disabled.  It require to big
rework in resource controle feature.

The lxc only integration (without container-manager integration) has some
limitation for device support.  For example, it can't handle dynamic
device/network interface change, it' can't protect device access from
guest using mknod.  On the other hand, if I mantain to this integration,
it need many human resource.  The lxc only integration does not have
value for these work.

This change drop lxc only integration.  This strategy was discussed
in gerrit 30506.

Bug-AGL: SPEC-5283

Change-Id: I66b209cdf7fa6bf77439a24211de4da7dcdfa873
Signed-off-by: Naoto Yamaguchi <naoto.yamaguchi@aisin.co.jp>