allow lxcapi_get_cgroup_item() on lxc-execute containers
allow lxcapi_get_cgroup_item() on lxc-execute containers

Containers started with lxc-execute may not have a conf, but
nothing in the implementation of lxcapi_get_cgroup_item()
actually needs/uses it, and it can be useful to get items out
of the containers' cgroup items.

Signed-off-by: Dwight Engen <1793d65cf7b9eefb2bb8f5bee9a4b8ba782c26da@oracle.com>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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