lxccontainer: remove locks from get_cgroup_item()
lxccontainer: remove locks from get_cgroup_item()

The on-disk config file is not altered and the in-memory config isn't
altered so no need for locking.

Signed-off-by: Christian Brauner <48455ab3070520a2d174545c7239d6d0fabd9a83@ubuntu.com>

ss1h2a3tw/lxc,ss1h2a3tw/lxc,hallyn/lxc,caglar10ur/lxc,caglar10ur/lxc,ss1h2a3tw/lxc,hallyn/lxc,caglar10ur/lxc,hallyn/lxc